NEC CD-803 cd player

NEC CD-803 Compact Disc Digital Audio Player

The CD-803 is no ordinary CD player, or it is based on NEC's many years of experience in all major areas of electronics and communications engineering - digital, optical, semiconductor laser, electronics, communications and precision machinery. No other CD player manufacturer has the technological background of NEC, the reason why the CD-803 provides unusually good sound quality and reproduction accuracy. Serious audiophiles and audio critics are now discovering what we already know; the CD-803 is the best executed CD player on the market.

What is a Compact Disc Digital Audio System.

Compact Disc Digital Audio is a system whereby an original analog signal is converted into a digital signal - a series of 0's and 1's in the binary code. This information, stored in the form of microscopic pits on a flat disc, is retrived by an optical (laser) beam, and finally converted back into analog form by a digital-to-analog (D/A) converter. The piece of audio equipment that retrives digital information from a CD and converts it into an analog audio signal is a CD player. The CD system offers tremendous advantages over the conventional analog system. For instance, dynamic range and s/n ratio both exceed 90 dB, and channel separation is better than 70 dB across an audio band extending from 5 Hz to 20 kHz. No wonder audiophiles and serious music lovers throughout the world have been awestruck by this new source of ultimate fidelity music.

Ease of operation

The CD-803 enhances ease of operation every bit as much as it improves sound quality. Advanced computer control means that it takes only minutes to learn every operating feature. Simply insert a disc into the front-panel door and touch the Open/Close button. As the door quietly closes, the disc rotates for a few seconds to enter encoded program data into the memory, and then stops. Now, by just touching the feather-touch operating buttons, you are ready to enter the realm of digital sound.

Memory play of up to 99 selections.

Up to 99 selections (tracks) on a disc can be programmed for play in any order. Moreover, by pushing the Repeat button, you can replay programmed selections as many times as you want. The average time it takes to locate  a selection, or access track time, is only three seconds. For your convenience, when you've completed initial programming, you can confirm each programmed selection (its track number and order) on the display by just touching the Memo List button.

Digital-domain technology

A Compact Disc contains a sophisticated error correction signal. By extrapolation, it is possible to reconstruct the original digital pulses accurately in instances where some are unreadable. However, severe dropouts, caused by external noise or damage to the disc, may prove too much for the error correction system. This led NEC to develop a three-stage servo for the disc motor which accurately detects and corrects for dropouts. Faithful reproduction is assured.

Digital-analog interface technology

Digital signals are composites of both left and right channel information in alternating sequence. A switching circuit divides the composite signal  into its left channel and right channel components. For this purpose, NEC developed an electronic switch which allows high-speed switching at a rate 10 times faster than commonly used C-MOS devices or analog switches. This significantly lowers high-frequency distortion. With the NEC electronic switching system, the signal runs in parallel with the Circuit rather than in series (as is the case with other switches(, so signal integrity is maintained.

Analog-domain technology

Once digital signals are converted into analog by the D/A converter, the sampling frequency (44,1 kHz) and its harmonic components must be eliminated completely by a low-pass filter. Commonly used active and passive filters suffer phase-related distortion called group delay, which led NEC to develop the ND (Non-Delay) filter. It reduces group delay at 20 kHz to 1/25 the value of other filter designs and significantly reduces unwanted spurious-frequency response.

Specifications

Player Section

System:  Compact Disc digital audio Player

Pickup:  GaAlSi Semiconductor laser

Sampling Frequency:  44,1 kHz

Quantization 16-bits linear/channel

Channels:  2

Frequency Response:  5 Hz - 20,000 Hz (±0,5 dB)

Dynamic Range:  90 dB or more

Signal-to-Noise-Ratio:  90 dB or more

Total Harmonic Distortion:  0,01% or less (5 - 20,000 Hz)

Channel Separation:  70 dB or more (5 - 20,000 Hz)

Wow and Flutter:  Equal to crystal oscillator accuracy

Output Level

Fixed : 1,5 V, 470 Ω 

Variable :  0 - 1,5 V, 2,5 k Ω 

Program Search Function:  program number or sub-number

Memory Functions:  Random memory access to up to 99 programs

Access Time:  3 sec. average

Power Requirements:  100 /120 /220 /240 V AC, 50/60 Hz

Power Consumption:  58 watts

Dimensions (W x H x D):  430 x 150 x 360 mm

Weight:  12 kg

Disc Section

Playing Time (single-sided, 2-channel):  74 minutes 45 seconds maximum

Scanning Velocity (2-channel):  1,2 - 1,4 m/s

Rotation:  Counterclockwise

Track Pitch:  1,6 µm

Diameter of Disc:  120 mm (4,8 inches)

Thickness of disc: 1,2 mm (0,0048 inch)

Diameter of Center Hole:  15 mm (0,6 inch)

Starting Diameter of program Area:  50 mm (2 inches)

 

KLH Model 331 loudspeakers

 KLH Dedicated Loudspeakers - A new standard in sound and styling

KLH has always had the uncanny ability to make graceful loudspeakers that could reproduce a remarkable amount of sound. This, coupled with an unfailing reputation for quality and hand craftsmanship, is the benchmark of the KLH tradition. With the Dedicated Series of KLH loudspeakers, the company adds further to that tradition by setting a new standard in sound and styling. Each of these five superb loudspeakers borrows freely from KLH's classic technology and are of acoustic suspension design.
The tweeters, midranges and cross-over networks are all vastly improved devices of completely new manufacture that represent the industry's most advanced technology (Indeed, the 4-1/2" midrange used in the Model 353 is considered by most experts as the best cone-type ever made and is usually found in only the most costly loudspeakers.)

Each of the five Dedicated Loudspeakers boasts increased efficiency over previous models - with much brighter sound and greater overall musicality. And each of them regardless of size or price, recreates the subtleties and innervoices of the orchestra demonstrably better than past competitive models. Stated simply, they are easily among the best loudspeakers we, or anybody else, has ever made.
They are also unquestionably, the best value we have ever offered. And since we've always offered one heck of a lot of speaker for the money, that's saying quite a lot. Here then, dedicated to you, is the new KLH Dedicated Series - beautiful loudspeakers for people who really care about what they hear.

KLH Model 331

Frequency Response:  50 Hz - 18 kHz

8 ohm two-way, ported cabinet loudspeaker system

One long excursion 8-inch KLH woofer;

One 2-1/4-inch cone tweeter

Minimum Recommended Power per Channel:  8 watts RMS

Maximum Power Handling (can be safely used with amplifiers rated up to): 75 watts RMS per channel

Wood grained vinyl on high density particle board

Removable front grille panel

Dimensions (H x W x D): 530 x 300 x 220 mm (21" x 12" x 8-3/4")

Weight (Shipping carton):  41 lbs (packed one per carton)

KLH Model 317 loudspeakers

KLH Dedicated Loudspeakers - A new standard in sound and styling

KLH has always had the uncanny ability to make graceful loudspeakers that could reproduce a remarkable amount of sound. This, coupled with an unfailing reputation for quality and hand craftsmanship, is the benchmark of the KLH tradition. With the Dedicated Series of KLH loudspeakers, the company adds further to that tradition by setting a new standard in sound and styling. Each of these five superb loudspeakers borrows freely from KLH's classic technology and are of acoustic suspension design.

The tweeters, midranges and cross-over networks are all vastly improved devices of completely new manufacture that represent the industry's most advanced technology (Indeed, the 4-1/2" midrange used in the Model 353 is considered by most experts as the best cone-type ever made and is usually found in only the most costly loudspeakers.)

Each of the five Dedicated Loudspeakers boasts increased efficiency over previous models - with much brighter sound and greater overall musicality. And each of them regardless of size or price, recreates the subtleties and innervoices of the orchestra demonstrably better than past competitive models. Stated simply, they are easily among the best loudspeakers we, or anybody else, has ever made.

They are also unquestionably, the best value we have ever offered. And since we've always offered one heck of a lot of speaker for the money, that's saying quite a lot. Here then, dedicated to you, is the new KLH Dedicated Series - beautiful loudspeakers for people who really care about what they hear.

KLH Model 317

Frequency Response:  45 Hz - 18 kHz

8 ohm two-way, high-efficiency, acoustic suspension loudspeaker system

One 10-inch KLH woofer;

One 2-1/4-inch cone tweeter

Three-position tweeter control switch - toggle

Minimum Recommended Power per Channel:  10 watts RMS

Maximum Power Handling (can be safely used with amplifiers rated up to): 100 watts RMS per channel

Wood grained vinyl on high density particle board

Removable front grille panel

Dimensions (H x W x D): 580 x 300 x 250 mm (23" x 12" x 9-3/4")

Weight (Shipping carton):  29 lbs (packed one per carton)

 

KLH Model 373 loudspeakers

A new standard in sound and styling

KLH has always had the uncanny ability to make graceful loudspeakers that could reproduce a remarkable amount of sound. This, coupled with an unfailing reputation for quality and hand craftsmanship, is the benchmark of the KLH tradition. With the Dedicated Series of KLH loudspeakers, the company adds further to that tradition by setting a new standard in sound and styling. Each of these five superb loudspeakers borrows freely from KLH's classic technology and (except the Model 331) are of acoustic suspension design.

 KLH Model 373
Frequency Response:  45 Hz - 22 kHz
8 ohm three-way, high-efficiency, acoustic suspension loudspeaker system
One 10-inch KLH woofer;
One 3-7/8-inch midrange;
One 2-1/4-inch cone tweeter
Two-position presence control switch - toggle
Minimum Recommended Power per Channel:  10 watts RMS
Maximum Power Handling (can be safely used with amplifiers rated up to): 150 watts RMS per channel
Wood grained vinyl on high density particle board
Removable front grille panel
Dimensions (H x W x D): 610 x 330 x 250 mm (24" x 13" x 9-5/8")
Weight (Shipping carton):  37 lbs (packed one per carton)

KLH Modell 363 loudspeakers

 KLH Dedicated Loudspeakers - A new standard in sound and styling

KLH has always had the uncanny ability to make graceful loudspeakers that could reproduce a remarkable amount of sound. This, coupled with an unfailing reputation for quality and hand craftsmanship, is the benchmark of the KLH tradition. With the Dedicated Series of KLH loudspeakers, the company adds further to that tradition by setting a new standard in sound and styling. Each of these five superb loudspeakers borrows freely from KLH's classic technology and are of acoustic suspension design.

KLH Model 363

Frequency Response:  30 Hz - 22 kHz

8 ohm three-way acoustic suspension loudspeaker system

One 12-inch KLH woofer;

One 5-inch midrange;

One 2-1/4-inch cone tweeter

Two rotary switches - one 2-position midrange control and one 3-position tweeter control

Minimum Recommended Power per Channel:  12 watts RMS

Maximum Power Handling (can be safely used with amplifiers rated up to): 150 watts RMS per channel

Wood grained vinyl on high density particle board

Removable front grille panel

Dimensions (H x W x D): 610 x 330 x 320 mm (24" x 13" x 12-5/8")

Weight (Shipping carton):  46 lbs (packed one per carton)

KLH Model 353 loudspeakers

KLH Dedicated Loudspeakers - A new standard in sound and styling

KLH Model 353

Frequency Response:  25 Hz - 22 kHz

8 ohm three-way acoustic suspension loudspeaker system

One very low resonance,

12-inch KLH woofer;

One 4-1/2-inch midrange;

One 2-1/4-inch cone tweeter

Two rotary switches - one 3-position midrange control and one 3-position tweeter control

Minimum Recommended Power per Channel:  25 watts RMS

Maximum Power Handling (can be safely used with amplifiers rated up to): 175 watts RMS per channel

Wood grained vinyl on high density particle board

Removable front grille panel

Dimensions (H x W x D): 660 x 360 x 320 mm (26" x 14" x 12-5/8")

Weight (Shipping carton):  49 lbs (packed one per carton)

 

Spectro Acoustics 101B preamplifier

Spectro Acoustics Model 101B

Preamplifier/Equalizer

The quality of a stereo component system lies in the audiophil's choice of equipment. The major influence affecting that quality is the interaction and influence of each component on other components and the culmination of those influences on the human ear. This is where the choice is made in selecting "quality" and whether to accept a particular sound as "right"

All things considered, the perfect listening environment is still the concert hall and reproduction of music must remain subjective. However, we want control over what we hear and have the facility to change what it is that reaches our ears. In musical reproduction this function is relegated to the concepts of tonal compensation, balance and volume. The equipment corollary is the modern preamplifier; a device which offers control over the amount of sound reaching our ears and which particular source we will listen to, (whether it be a tape recording, a phonograph record or a radio broadcast). In most cases, there is the ability to change the tonal content at specifically designated frequencies.

Spectro Acoustics, in attempting to obtain maximum performance value, offers the Model 101B preamplifier/equalizer for audiophiles who want the most in flexibility and performance at a reasonable price.

The Spectro Acoustic Model 101B  in order to optimize reliability and serviceability, is designed and constructed to utilize plug-together glass-epoxy circuit boards and 100% monolithic IC circuitry for consistent performance. All controls and connections are human engineered to give simple straight forward operation. The graphic panel of the 101B is a display of exactly what's going on inside of the unit. Control is at the user's finger tips to seek the level and range of sound that achieves personal satisfaction.

The equalizer circuit for the Model 101B is a totally new type based on Spectro Acoustics gyrator synthesis techniques similar to those used in the Model 210 Graphic Equalizer. The design is a hybrid coil/gyrator type which totally eliminates distortion and hum for equalizer circuitry. The filter parameters are optimized for maximum flexibility from a five band design and as an added benefit the highest and lowest frequency bands are "shelving" type to control the response well beyond are "shelving" type to control the response well beyond the extremes of audibility. The usefulness of the equalizer circuitry is further enhanced through its complete availability to line or tape outputs, or total bypass for equalization in/out comparisons.

In phono stage, the Model 101B utilizes an isolated feedback servo op-amp phono stage with ultra-accurate adherence to the RIAA curve. This circuit provides for accurate cartridge response, increased definition of high frequencies and greater dynamic range. Internally accessible cartridge loading components can be adjusted by any qualified and authorized technician to perfectly match the cartridge load for any cartridge.

Specifications

Total Harmonic Distortion:  less than .05% at 2 volts rms output, 20Hz to 10kHz, 10 k Ω  load

Intermodulation Distortion; less than .01% at any output level below clipping, 7kHz and 60 Hz mixed 1 to 4 (SMPTE)

Noise

Phono Stage:  less than 2 mV equivalent input noise, 20Hz to 20kHz, inputs open or shorted (S/N ratio = at least 74 dB below 10 mV reference) Better than 88 dB below full output (ASA standard "A" weighting)

High Level & EQ Stages:  less than 30 mV equivalent input noise, 20Hz to 20kHz, inputs open or shorted (S/N ratio = at least 90 dB below 1 V reference) Better than 100 dB below full output (ASA standard "A" weighting)

Frequency Response: 

Phono Stage : within 0,5 dB of true RIAA equalization, 20Hz to 20kHz, typically within 0,1 dB

High Level Inputs : within 0,1 dB of absolutely flat response, 20Hz to 20kHz, within 3 dB of absolutely flat response, 5Hz to 100kHz

Gain

Phono Stage :  40 dB at 1 kHz, phono stage alone, 50 dB at 1 kHz, phono +line amplifier (main outputs)

High Level Stage :  10 dB with Level controls set to maximum

Equalizer Stage :  Plus or minus 15 dB nominal range of adjustment, within 0,1 dB of unity gain, controls set flat

Dynamic Range

Phono Stage : Overload point is 100 mV at 1 kHz input

High Level Stage :  Overload point is 10 V at 1 khz into 10 k Ω  load

Port Impedances

Phono Units :  47 k Ω  shunted by 220 pF (internally adjustable)

High Level Inputs :  50 k Ω  shunted by 10 pF

Tape Inputs less than 600 Ω , resistive, direct coupled

Main Output :  less than 600 Ω , resistive, direct coupled

Output Capabilities

Rated Output:  2 volts rms into 10 k Ω  load, resistive

Output at Clipping :  Greater than 9 volts rms into 10 k Ω  load, greater than 5 volts rms into 600 Ω  load at 1 kHz

Protection:  Fully protected against short circuits at any output level

Power Requirements:  110 to 125 VAC, 50/60 Hz, 14 watts (Standard unit); 220 to 250 VAC, 50/60 Hz, 14 watts (Export unit)

Physical Data

Dimensions (W x H x D):  381 x 152,4 x 140 mm (15" x 6" x 5-1/2")

Optional Wood Cabinet (W x H x D):  412,8 x 184,2 x 421,3 mm

Weight :  10 pounds shipping

 

Kenwood LS-406 loudspeakers

 Kenwood LS-series

Speaker Systems Way Ahead of Their Time

Introducing the most advanced development in speaker design and technology, with extended dynamic range, well-dispersed sound distribution and well-defined, solid bass.

Featuring:

The Kenwood Daphne Diaphragm, "perfect" diaphragm material for clean, clear sound.

Lumber-Core Baffle Board, to cut vibration and produce distinct, rich sound without distortion.

Bass-Reflex Design, mathematically calculated to deliver optimum bass response.

Low-Frequency Driver, carefully designed for well-defined, solid bass.

Linear Diaphragm Suspension, to keep bass resonance low and permit clean reproduction of the lowest frequencies

High-Frequency Driver, with dome-shaped diaphragm and well-designed dimensional relationships for exceptional presence.

Specifications LS-406

Drivers

Woofer:  10"

Tweeter: 1" dome

Frequency Response:  48 Hz to 20,000 Hz ±5 dB

System Resonance or Tuning:  36 Hz

Nominal/Minimum Impedance:  8 Ω  / 7,1 Ω 

SPL for less than 2% Harmonic Distortion:  103 dB

Typical Distortion Maximum (at any Frequency Above 100 Hz at 100 dB SPL):  1,0%

Average Acoustic Output at 2,73 V (1W/1m):  90 dB

Crossover Type:  LC

Acoustical Crossover Frequency:  3,500 Hz

Electrical Crossover Frequency:  2,000 Hz

Controls:  3 Position

Input Power to produce 90 dB SPL per 1000 Cubic Feet of Room Volume : 1,2

Dimensions (W x H x D):  15" x 25-3/4" x 12-1/2"

Weight:  38 lbs

Kenwood LS-405 loudspeakers

Kenwood LS-series

Speaker Systems Way Ahead of Their Time

Introducing the most advanced development in speaker design and technology, with extended dynamic range, well-dispersed sound distribution and well-defined, solid bass.

Featuring:

The Kenwood Daphne Diaphragm, "perfect" diaphragm material for clean, clear sound.

Lumber-Core Baffle Board, to cut vibration and produce distinct, rich sound without distortion.

Bass-Reflex Design, mathematically calculated to deliver optimum bass response.

Low-Frequency Driver, carefully designed for well-defined, solid bass.

Linear Diaphragm Suspension, to keep bass resonance low and permit clean reproduction of the lowest frequencies

High-Frequency Driver, with dome-shaped diaphragm and well-designed dimensional relationships for exceptional presence.

Specifications LS-405

Drivers

Woofer:  10"

Tweeter: 1" dome

Frequency Response:  58 Hz to 20,000 Hz ±5 dB

System Resonance or Tuning:  43 Hz

Nominal/Minimum Impedance:  8 Ω  / 7,1 Ω 

SPL for less than 2% Harmonic Distortion:  103 dB

Typical Distortion Maximum (at any Frequency Above 100 Hz at 100 dB SPL):  1,5%

Average Acoustic Output at 2,73 V (1W/1m):  90 dB

Crossover Type:  LC

Acoustical Crossover Frequency:  3,500 Hz

Electrical Crossover Frequency:  2,000 Hz

Input Power to produce 90 dB SPL per 1000 Cubic Feet of Room Volume : 1,2

Dimensions (W x H x D):  12-3/4" x 23-1/4" x 11"

Weight:  31 lbs

 

Electro-Voice Sentry 100EL monitor

Electro-Voice Sentry 100EL

Professional Powered Monitor System

Near-field monitor for post production and live sound

Wide, uniform coverage

Extremely smooth frequency response

High power handling

High-Performance, built-in, 50-watt amplifier for remote operation

Description

The Electro-Voice Sentry 100EL powered monitor speaker system combines the advantages of the Sentry 100A monitor with a self-contained, high-Performance power amplifier. It is designed with the broadcast/recording studio engineer in mind, although it is well suited for a wide variety of professional applications. The Sentry 100EL offers uniform frequency response and dispersion across a wide range.

A Super-Dome tweeter is employed to faith-fully reproduce program material at high levels, with response out to 18,000 Hz and uniform dispersion (120(O) at 5,000 Hz) The low-frequency section is an 8-inch direct radiator woofer installed in an optimally vented enclosure with fourth-order Butterworth tuning. The optimally vented design is responsible for the unusual combination of small size, extended bass response and high efficiency. Such performance is simply not available in other enclosures of similar size.

The Sentry 100EL is housed in a utility cabinet wrapped in a special scratch-resistant, matte black vinyl. The cabinet size is intentionally designed fro rack mounting. The steel-reinforced grille is covered with a custom gray cloth. This provides maximum protection and a pleasing, aesthetic quality.

The Sentry 100EL may be driven room any line-level signal source. An XLR-type connector is provided for use with balanced sources, while a 1/4-inch phone jack accommodates unbalanced lines. Uses only the appropriate connector; both should not be connected at the same time. Although both inputs are protected against voltage peaks of up to 100 volts, connection from an external power amplifier is redundant and invariably results in increased noise and distortion.

Most importantly, a sharp cutoff, high-pass filter is included which has been precisely tailored to the Sentry 100EL response. It provides a dramatic reduction of energy-wasting, sub-sonic signals in the amplifier and woofer. By controlling low-frequency cone excursion and amplifier power, program material any often be reproduced at higher levels without distortion and without any reduction in acoustic low-frequency response.

A system level control is located on the front of the enclosure which varies the gain of the amplifier from zero over a useful range of more than 30 dB. Additionally, a red indicator lamp shows when AC power is applied to the Sentry 100EL. A replaceable AC power fuse is located on the rear panel of the system. The rating and type are identified beside the fuse holder. Under normal conditions, even with momentary overloads, the fuse will not blow.

Specifications

Frequency Response:  48 to 18,000 Hz (1m on Axis, Anechoic Environment, Swept One-Third-Octave Pink Noise +_3 dB)

Dispersion Angle Included by 6 dB Down Points, 10 Foot Microphone Distance, Anechoic Environment, One-Third Octave Bands Of Pink Noise

Horizontal

250 - 6,300 Hz (158°  ±32° )

8,000 - 20,000 Hz (55°  ±18° )

Vertical

250 - 6,300 Hz (140°  ±40° )

8,000 - 20,000 Hz (52°  ±13° )

Crossover Frequency:  2,000 Hz

Sound Pressure Level(1m, max. gain, 0 dBu into Balanced Input, Anechoic Environment, 300 - 2,000 Hz Average):  108 dB

Dimensions (H x W x D):  438 x 305 x 292 mm (17,25" x 12,0" x 11,5")

Net Weight:  15 kg (33 lb)

Amplifier Section

Continuous Sine Wave Power (6 ohm load, 120 V line):  50 watts

Dynamic Range:  92 dB minimum

Residual Noise (max. Gain, 600 Ω  source, 20 - 20,000 Hz bandwidth):  400 µV max

Power Bandwidth (-3 dB):  30 - 20,000 Hz

Total Harmonic Distortion:  (1,000 Hz, 50 watts): 0,05% typical

Low Frequency Filter

Slope :  12 dB/octave

-3 dB Point :  28 Hz

Balanced Input, Sensitivity (50 watt output):  0,775 V (0 dBu)

Impedance:  30 k Ω 

Maximum Level:  8,0 V (+20 dBu)

Common Mode Rejection:  40 dB minimum

Connector Type:  3-pin XLR-type female

Polarity (for positive sound pressure):  Pin 2 positive

Unbalanced Input, Sensitivity (50 watt output):  0,39 V (-6 dBu)

Impedance:  10 k Ω 

Maximum Level:  30 V (+32 dBU)

Connector Type:  1/4-inch phone jack

Polarity (for positive sound pressure):  Tip positive

Power Requirement

Domestic Model :  120 watts max. 105 - 130 V, 60 Hz

Fuse :  1-1/2 A slo-Bloe, Type 3AG MDL or MDX

Export Model :  210 - 260 V, 50/60 Hz

Fuse :  800 mA slow acting, type FTT

 

Electro-Voice Sentry 100A loudspeakers

ELECTRO-VOICE Sentry 100A

Sentry Studio Monitors, superb standard of audio reproduction

Sentry 100A for tight spaces

Just because your monitor space is limited, you don't have to compromise on sonic accuracy. The Sentry 100A is a compact, no-frills system that's ideal for restricted environments like mobile recording studios. it's the oldest member of the Sentry family and has become the industry standard of reliability.

The Sentry 100A delivers a flat 45 - 18,000 Hz frequency response with wide 120°  dispersion at 5000 Hz. The Super-Dome tweeter handles a remarkable 25 watts of input power and is matched with an 8" direct radiator woofer in an optimally vented enclosure.

The Sentry 100A is designed for efficient set up and operation. With the optional SRB-7 rack mount kit, the monitor can be installed from the front to a standard EIA 19" rack. The front mounted high frequency control allows quick and easy boost and cut adjustment.

Specifications

Frequency Response:  45 - 18,000 Hz ±3 dB

Dispersion Angle (Included by 6 dB Down Points):  

250 - 6,300 Hz :

Horizontal :  158°  ±32° 

Vertical :  140°  ±40° 

5,000 - 20,000 :

Horizontal :  55°  ±18° 

Vertical :  52°  ±13° 

Sound Pressure Level (at 1 m/1 W) :  91 dB

Power Handing Capacity:  30 W

Power Handing Capacity (10 ms above 40 Hz):  300 W

 

Kyocera D801 cassette deck

Kyocera Model D-801 Cassette Deck Incorporating Dual Capstan 3-motor tape Transport mechanism with Dolby B and C Noise Reduction

With the perfectionist in Mind Cybernet technology has gone all out to produce a cassette deck that will make even the most particular tape enthuiast stop and wonder.

In a nutshell, Cybernet's D-801 has been designed to improve dynamic characteristics. Briefly, although values of static characteristics of a cassette deck (such as signal-to-noise ratio, Wow and Flutter) have almost reached the measurable limit, those characteristics which may not be reflected on actual spec values but which affect audible sound differences must be improved. For this reason, we have decided to use the double capstan two head concept which contributes to meaningful areas of operation, such as Wow and Flutter, frequency response and appropriate head to tape pressure.

FET Amplifier

Because no cassette deck is better than its amplifier, Cybernet uses FET amps in the input stages for superb record / playback head characteristics. Signal-to-Noise-Ratio  and excellent Frequency Response  are improved by direct coupling of the R/P head amp FET to the first stage amp FET.

The Drive for Excellence

To insure constant speed drive and least possible Wow & Flutter, the D-801 uses a 2-capstan drive. This provides individual capstans and pinch-rollers for both the take-up and feed reels, thus insuring the proper tape also runs smoothly and with optimum tape tension, virtually eliminating external shock modulating noise which sometimes causes tape vibration while in play or record mode.

The capstans are driven directly by a brushless frequency generated servo motor. because of this motor driving only the capstans, better and uniform torque is achieved resulting in improved Wow & Flutter and tape speed accuracy.

A second DC governorless motor is used to drive both the take-up and feed reels, while a similar third motor gently positions the record/playback head against the tape surface. This innovative approach results in long lasting head-to-tape positioning accuracy and maximizes proper head azimuth alignment.

The tape transport incorporates two electromagnetic brakes, one for feed and the other for take-up reel rewind. This super braking action protects the tape from stress damage, breaksge or distortion when stopping in the fast forward or rewind mode.

Dolby B and C Noise Reduction

While many audiophiles have been using the Dolby B system, Cybernet now has incorporated a Dolby C system for greater dynamic range and frequency response.

Now, with Cybernet's Kyocera Model D-801 Cassette Deck, new superior recordings can be made.

Basically, the Dolby B system reaches greatest effectiveness above 4 kHz, reducing noise by about 10 dB. Dolby C reaches effectiveness from 1 kHz and above and provides up to 20 dB of NR. By having both systems built into the Model D-801 Deck, Cybernet lets the user make the choice.

APMR Feature

Automatic Program Mute Recording is a system built into the D-801 providing 5-second unrecorded portions in the tape when in record mode. In playback these gaps are useful for locating the beginning or the end of the recorded segments. The 5-second unrecorded gaps are utilized by the auto search feature to stop at the beginning of the program continues for five seconds and automatically advances to the next program unless the play button is activated in order to stop auto search.

Versatility and Convenience

In addition to its feather-touch pushbutton mechanism, automatic memory functions are included for memory stop, auto stop, auto play and auto repeat. Other functions included are shutoff at end of playback, record, fast forward and rewind modes. Complementing these features is an electronic 4-digit counter for elapsed time, remaining time and stopwatch.

Tape selection, bias and equalization are provided for all current tape types including metal. In addition, fine adjustment provides optimum performance from the selected tape brand.

Performance is assured by Cybernet's use of a Sendust alloy rewind/playback head. This meets the needed demand for top=notch performance with to-day's metal tape. A built-in 400 Hz calibration tone enables proper adjustment of record/playback levels for each channel.

Other convenience features include LED indicators for function modes, L/R channel peak levels, record level balance and output controls, illuminated cassette compartment with viscous damped cassette door and headphone jacks for private listening, as well as record peak level hold.

Specifications

Front Panel Features

Tape transport - Rewind, Stop, Fast Forward, Play, Pause, Record, APMR, Auto-Search - all feather touch pushbuttons

Record level volume - Slide controls

Record balance volume - Rotary control

Output level control - rotary control

Tape selector switch - Normal, CrO₂ , Metal - pushswitch

Noise reduction pushswitch - Dolby NR - On/Off; Dolby NR - B/C; MPX Filter - On/Off

Fine bias adjust control - rotary

Pushswitch - Line-Mic, memory off Stop-Replay, Auto Repeat, rec-calibration, and Power-On/Off

Eject button

Headphone jack (6 m/m dia.)

Mircophone jacks (6 m/m dia.) for left and right channels

Separate LED Peak level display for left and right channels

LED (Green) indicator for Dolby NR on

LED (Orange) indicator for Dolby NR-C  on

Transport function indicators:

Play - Green

Pause - Orange

Rec.  - red

Digital tape counter

Tape  selector LED indicators

Green: Normal CrO₂ , Metal

Rear Panel Sockets

AC power cord with plug.

Line input and output jacks (pin type)

Mechanical Specifications

Motor

Capstan Drive :  Brushless FG servo

Head Assist :  DC motor governerless

Reel Drive :  DC Motor Governerless

Wow and Flutter (MTT-111 as per WRMS JIS):  0,02%

Speed Tolerance (MTT-111):  ±0,5%

Time Required for Rewind/FF

C-60 applicable:  70 sec.

Electric Specifications

Signal-to-Noise-Ratio: 

DIN 45500, 70 µsec, EQ. Tape weighted-A :  58 dB

Dolby NR - B effect (CCIR weighted) :  10 dB

Dolby NR - C effect (CCIR weighted) :  20 dB

Input Sensitivity / Impedance

Mic :  0,5 mV/10 k Ω 

Line :  70 mV/50 k Ω 

Output

Line (0 VU, Dolby NR level) :  580 mV

Headphone jack :  40 mV

Harmonic Distortion (1 kHz, 0 VU level):  1,5 %

Separation:  40 dB (1 kHz)

Erasure (Band pass filter):  70 dB (1 kHz)

Bias Fine Adjustable Range:  ±15%

Recording Calibration:  400 Hz (0 VU)

Time Required to Activate the Auto-Shut-Off:  4  sec.

APMR Time:  5 sec.

General Specifications

Power Requirement:  AC 120 V 60 Hz

Dimensions (W x H x D):   430 x 132 x 300 mm (17" x 5-3/16" x 11-13/16")

 

Technics SB-4000 loudspeakers

 Technics SB-4000

Linear Phase Speaker System

The amazing waveform fidelity of the Technics Linear Phase speaker systems has now gained widespread attention. With the SB-4000 is a similar system . Yet it still retains the essential crispness and transparency of sound that characterizes its forerunners. As our oscilloscope tests have shown, sound pressure waveforms of musical instruments played through the Linear Phase system mirror almost exactly the original waveforms. This remarkable technological achievement came only after months of patient research by teams of dedicated audio specialists. The important elements of balanced tonality, finely etched transient response and excellent stereo imaging are all there, contributing tot a very convincing impression of live music.

Optimum speaker location By precisely aligning the acoustical centers of the speaker units and placing them physically as close together (while keeping them acoustically isolated). Technics engineers have succeeded in attaining phase linearity with even sound distribution. Moreover, the location of the units is finely tuned to compensate for slight phase shift in the crossover region. You will notice that the woofer is placed well away from the floor level to reduce boomy floor effects.

Vented Design for bass extension with excellent Power Handling

The SB-4000 is perfectly at ease handling Power up to 75 watts . And the High 91 dB efficiency assures ample volume, even with low power input. A surprisingly rich, solid bass response is achieved with a carefully tuned vented cabinet.

Specifications

Type:  2-way, 2-speaker bass-reflex system

Speakers:

Woofer : 200 mm cone type

Tweeter :  60 mm cone type

Impedance:  8 Ω

Power Handling Capacity:  75 W (Music) 50 W (DIN)

Output Sound-pressure Level:  91 dB/W (At 1,0 m)

Crossover Frequency:  2,500 Hz

Frequency Range:  45 Hz - 20,000 Hz (-10 dB)

Dimensions (W x H x D):  280 x  561 x 248 mm

Weight:  10 kg

Toshiba SB-404 amplifier

Technical Features

The all stage direct coupling OCL (Output Condenser Less) type IC amplifiers (output music power 68W) are installed in all the four main amplifiers to increase their performance and reliability.

When used with two speakers and a BTL (Balanced Transformer Less) connection, approximately twice as much power is obtained, than when used with only one speaker.

All the two channel program sources (record, open reel, cassette, cartridge tape, FM broadcasting, etc.) can be reproduced in the four channel fashion with the built-in QME (QM Effect) unit.

This stereo amplifier has a built-in special condenser-cartridge (model number C-401S) amplifier and consequently can be directly connected to the player, and further can be switched to the magnetic cartridge with the aid of the switch.

The level of each channel can be easily adjusted, because the accurate detection of the level of each channel is made possible by the four built-in large scale level meters.

The low-noise transistors, which are produced on the basis of the PCT manufacturing method developed by the Toshiba, are used for all transistors in this amplifier.

The reproduction of all the channel program sources is possible with this unit because two systems of input terminals for four channels are provided.

The four channel tape deck can be also used with this amplifier.

Two channel headphone may be used as well as the four channel type, (model number HR40) utilizing both the front and rear headphone jacks provided.

Condenser-Cartridge Amplifier

There are two types of cartridge, the velocity proportional type (MM, MC, etc.) and the amplitude proportional type (photoelectric cartridge, etc.). The condenser-cartridge belongs to the latter type and a special correction curve different from the conventional one is necessary. The power for the ICs in the cartridge is supplied through the ground of the input terminal R channel. This amplifier can be directly connected with the condenser cartridge (This is not the case for the photoelectric cartridge).

BTL Circuit

When the four channel amplifier is used for reproduction with two speakers, this circuit is used in order to operate the four amplifiers effectively. The output voltage of two factors of magnitude can be supplied between the output terminals of each amplifier when the one speaker is operated in phase and the other out of phase with the use of the phase reverse circuit.

Although the output power is theoretically of the four factors of magnitude from the relation, —(2V)?/R=4V?/R, that is in practice reduced to about two factors of magnitude due to losses such as the regulation of the transformer, the emitter resistance, etc.

Main Amplifier

Music Power Output (IHF):

30 W x 2 (at 8 Ω  BTL. 0,8% THD)

17 W x 3 (each channel at 8 Ω , 0,4% THD)

Continuous Power Output:

26 W x 2 (at 8 Ω , BTL, 0,4% THD)

15 W x 4 (each channel , 8 Ω , 0,4% THD)

Output:  IHF Music Power on x 2 (Distortion 0.8% BTL 17 W x 4 RMS. 96 W x 2 BTL. (Distortion 0.4%) 15 W x4

Distortion Factor:

Total Harmonic Distortion Factor: At rating output 0.4% At 2 W output 0.1%

Intermodulation Distortion Factor: At rating output 0.8% At 2 W output 0.2%

Frequency Response:  1O Hz - 55 kHz +0, -3 dB

Input Sensitivity and Impedance:

Main In :  0,5 V (37 k Ω )

Residual Noise:  0,8 V/8 Ω 

Damping Factor: 20 (8 Ω )

Speaker Impedance:  4 - 16 Ω  (BTL  8 - 16 Ω )

Pre-amplifier

Input Sensitivity and Impedance:

Phono 1 Mag :  3 mV / 47 k Ω 

Phono 1 CC :  30 mV/70 k Ω 

Phono 2 :  3 mV/47 k Ω 

Tuner :  150 mV/47 k Ω 

Aux 1 (4CH) :  150 mV/47 k Ω 

Aux 2 (4 CH) :  150 mV/47 k Ω 

4CH Tape :  300 mV/47 k Ω 

Recording Output:

Tape Rec :  150 mV

DIN :  30 mV

Pre Out :  0,5V (Max. 4,2 V)

Frequency Response:  5 Hz - 100 kHz +0 -3 dB

Total Harmonic Distortion Factor:  At rating output 0,04%

Maximum Input Voltage:  

Phono Mag :  100 mV (1 kHz)

Phono CC :  1,2 V (1 kHz)

Tone Control

Bass :  ±10 dB at 100 Hz

Treble :  ±10 at 10 kHz

Equalizer:  RIAA Standard +0,5 dB, -0,5 dB (Curve)

Signal-to-Noise-Ratio: 

Phono Mag :  65 dB (3 mV)

Phono CC :  70 dB (30 mV)

Phono Aux  :  80 dB (150 mV)

Power Source Voltage:  AC 100/120/220/240 V, 50/60 Hz

Transistors:  5 ICs , 26 Transistors, 10 DIodes

Dimensions (W x H x D):  400 x 280 x 150 mm (15-3/4" x 11" x 4-1/2")

Weight:  7,5 kg (16 lbs)

 

JVC JT-V31 tuner

JVC JT-V31 High Fidelity FM/AM Tuner

What do you want from a tuner? Easy station selection and high fidelity sound are the two most important things, naturally. But how can you be sure that the tuner you're about to buy will deliver them? Here's what our JVC audio engineers have to say about the new JT-V31.

"Providing the two most basic function of a tuner, if it is to be strictly hi-fi, is a challenge most research labs and theoretical thinkers think is easy to meet. But in practice you find that an ingenious circuit designed to solve one problem - say that of increasing FM selectivity - might lower the sensitivity, or degrade other specifications, once you get it wired into your prototype model. So the so-called perfect circuit is not so ingenious after all. In truth, we've made the best compromises we could in the JT-V31. It's really state-of-the-art and we think it's a lot of tuner for the money."

The longer you own it, the more you'll appreciate it. It's the JT-V31 from JVC - Listening for the future.

FM 65 dB Selectivity

Selecting the station you want in FM-crowded urban areas is a growing problem in tuners not built for the job. The JT-V31 however has a new 4-resonator type single-unit ceramic filter to help achieve an impressive 65 dB selectivity without degrading other important specifications.

Precision Built FM Frontend

A dependable frequency linear tuning capacitor in the FM frontend increases sensitivity to distant or weak stations and affords high tuning precision.

FM Stereo PLL Circuit

The newly developed PLL (Phase-Locked Loop) circuit in an IC form delivers outstanding stereo separation over an IC form delivers outstanding stereo separation over a wide frequency range with more reliability and stability than conventional multiplex (MPX) circuits. Independent left/right-channel low-pass filters eliminate crosstalk for more precise sound image location.

IC Construction

Three high-integration IC formed blocks, one each for the FM-IF FM-MPX, and AM, guaranties dependability and reduce service needs.

FM/AM Tuning Ease

The extra long (240 mm ) dial is frequency linear for FM and is designed scientifically for easiest reading in actual use. The mechanism has a high-inertia flywheel and stretch-free "radial cord" cables to maintain high precision operation in all types of environment.

Twin Tuning Meters

The signal strength meter (FM an AM) at the left side of the meter window always responds in linear proportion to the strengths of incoming signals without overloading. Its circuit is the integral-linear type and is never :fooled" (saturated). The FM tuning meter at the right is equally well built, providing visual confirmation of the tuning of an FM signal to the point where distortion is minimal and stereo separation best.

Additional Features

Hi-Blend Switch - Enables elimination of high-frequency FM noise for optimum stereo separation

Low Distortion AM  - IC with self-contained RF amp. low-pass filter and ceramic filter assures clear, pleasant AM sound.

FM Muting - Switch ON (in normal position) to eliminate FM inter-station noise, or OFF to tune in weak or distant stations.

Specifications

FM Tuner Section

Tuning Range:  88 MHz – 108 MHz

Usable Sensitivity (IHF):  1,9 µV

50 dB Quieting Sensitivity

Mono :  4,0 µV

Stereo :  40 µV

Distortion at 100 Hz

Mono : 0,2%

Stereo :  0,5%

Distortion at 1 kHz

Mono : 0,2%

Stereo :  0,35%

Distortion at 6 kHz

Mono : 0,2%

Stereo :  0,4%

Signal-to-Noise-Ratio:

Mono  :  72 dB

Stereo  :  50 dB

Selectivity:  60 dB

Capture Ratio:  1,2 dB

Alternate Channel Selectivity:  60 dB

Spurious Response Ratio:  80 dB

Image Response Ratio:  60 dB

IF Response Ratio:  90 dB

AM Suppression Ratio:  50 dB

Stereo Separation:  40 dB (at 100 Hz); 45 dB  (at 1 kHz); 35 dB  (at 10 kHz)

Frequency Response:  30 Hz  – 15 kHz +0,5 dB , -2,5 dB

Subcarrier Product Ratio:  50 dB

Output Level:  750 mV  (400 Hz, 100% Mod.)

AM Tuner Section

Tuning Range:  525 kHz – 1605 kHz

Usable Sensitivity:  300 µV/m (Bar antenna); 50 µV  (External antenna)

Signal-to-Noise-Ratio:  50 dB

Distortion :  0,5%

Selectivity :  30 dB

Image Response Ratio:  45 dB

IF Response ratio:  45 dB

Output Level:  750 mV  (400 Hz, 100% Mod.)

General

Power Sources

AC 120 V, 60 Hz (USA, Canada)

AC 220 V, 50 Hz (European Countries)

AC 110/120/220/240 V, 50/60 Hz (Other Countries)

Dimensions (W x H x D):  390 x 152 x 358 mm (15-11/32” x 6” x 14-3/32”)

Weight:  5 kg (11 lbs)

 

Infinity Quantum 5 loudspeakers

 Infinity Quantum 5

Hard to believe until you hear it  - and even then; that a moderately-sized speaker at a most reasonable price can house the most advanced high-and low-frequency drivers (plus a high-definition midrange dome) and set them free to operate in all their realism.

That's the beauty of the Quantum 5 by Infinity.

Our superlative EMIT and the revolutionary Infinity -Watkins Dual-Drive Woofer are vital ingredients of our formidable Quantum reference Standard speaker-and-equalization system priced at several thousand dollars.

Now the Quantum 5 - at a small fraction of the cost of the Quantum Reference Standard  - has an EMIT and a dual-voice coil woofer of its own. And a sound that would be a revelation from any size speaker, at any price.

IN a woofer, two voice-coils are better than one. In performance, our dual-voice-coil woofer is better than any other.

Impossible combination: good transient response, sufficient power, acceptable efficiency, and extended bass range - all from an enclosure of reasonable size.

Now Infinity brings you Wiliams Watkin's ingenious solution to problems of a speaker's fundamental resonance, back-EMF, and the resultant impedance peak.

The Infinity-Watkins Dual-Drive Woofer, available only in Infinity's Quantum Series speakers, works like this.

In the frequency range where rising impedance and falling response were considered inevitable, a second voice coil takes over. In the region of resonance, it presents a low impedance path to the amplifier.

Now back-EMF is reduced, so the speaker can make use of the amplifier's power at low frequencies. Now it isn't inherent resonance but input that controls the cone. Now extended bass response co-exists beautifully with accurate transient performance. Now the superb bass reproduction of the dual-voice-coil woofer is yours in a reasonably priced compact speaker, Infinity's marvelous Quantum 5.

Is this any way to treat a revolutionary woofer?

In our top-of-the-industry Quantum Reference Standard, the Watkins is the Oscar Peterson of woofers; it can loaf, and still out-perform the rest of the world. It is responsible for response only from its phenomenal floor of 18 Hz to an easy 100 Hz/

As used in the three-way Quantum 5, the revolutionary woofer handles a frequency range from 30 through 600 Hz. So we give the cone a special treatment to increase greatly its stiffness-to-mass ratio. This damping treatment eliminates a variety of circumferential modes and resonances that blur the bass and muddy the midbass in ordinary speakers. Low-frequency reproduction from the Quantum 5 is exciting in its combination of clarity with power. In the vital midrange, Quantum 5 uses Infinity's high-definition dome driver. It is exceptionally accurate in its range from 600 to 4000 Hz. And from 4000 Hz up - far up.

The superlative, soaring EMIT - clearly superior to domes and cones. And electrostatics.

In theory, the magnetic counter-part of the electrostatic tweeter would be just as clean, accurate, and high-ranging as the electrostatic - and trouble-free besides.

In fact, our exclusive EMIT with its magnets of the rare-earth substance Samarium Cobalt, the most powerful magnetic material on earth, is all of that and more.

The EMIT exhibits nearly perfect horizontal dispersion - clearly superior to electrostatics' narrow beaming of high frequencies. And EMIT, more than either electrostatics or conventional dome drivers, is capable of reproducing every transient peak, every fortissimo as accurately as every subtely in the most demanding recording. Listen.

IN scientific measurements and, more important, in listening tests, EMIT stays smooth as high as your ears can follow. beyond that, they keep going right up to 32,000 Hz. Infinity invented the Electromagnetic Induction Tweeter. And only Infinity offers you its advantages. It's standout technological advance and it blends beautifully with the midrange dome and Watkins woofer - thanks to Infinity's meticulous attention to crossover technology and phasing.

The resulting output of a Pair of Quantum 5 speakers has an almost pictorial depth. You place each musician or section front or rear, as well as left or right, as naturally as at a concert.

Specifications

Frequency Response:  38 through 32,000 Hz ±3 db

Horizontal Dispersion:  -2 dB 60°  left and Right (20 kHz)

Suggested for use with amp. or receivers of:  30 Watts to 250 watts per channel RMS

Nominal Impedance:  4 Ω 

Drivers

LF :  300 mm (12") Infinity-Watkins Dual-Drive Woofer

MR:  38 mm (1-1/2") high-definition dome midrange

HF:  EMIT tweeter

Crossover Frequencies:  600 Hz and 4,000 Hz

Level Controls: Midrange and Tweeters

Dimensions (H x W x D):  670 x 380 x 300 mm (26-1/2" x 15" x 12")

Weight (packed):  25 kg (55 lbs)

Finish:  Oiled walnut veneer or particle board;

Grille:  Black cloth removable grille.

Infinity Quantum 4 loudspeakers

Infinity Quantum 4

The sound of this smallest floorstanding speaker in the Quantum Series is eloquent. It clearly proclaims that with Infinity, a music-lover who has to compromise on the cost of elements of an audio system doesn't have to suffer equal compromises on quality.

In 1976 our Quantum Line Source (height, well over five feet price well over $1000) set a whole new industry standard with the first use of superlative EMIT tweeters and the Infinity-Watkins Dual-Drive Woofer, among other advances.

 Now The Quantum 4 (much smaller size, much lower price) seems certain to set the new standard for compact three-way speakers, with an EMIT and dual-voice-coil woofer ot its own. Among other advances.

What two voice coils do for our remarkable woofer.

It has always been impossible to get good transient response, sufficient power, an acceptable level of efficiency and extended bass range from an enclosure of reasonable size. Till now.

Now William Watkins has found, and Infinity has made excellent use of, the solution to problems of a speaker's fundamental resonance, back-EMF, and the resultant impedance peak. Watkins's invention, available in Infinity speakers and no others, is a woofer with two voice-coils, called the Infinity-Watkins Dual-Drive Woofer. It works like this:

Down among the frequencies where rising impedance and falling response were inevitable before, the second voice-coil takes over. In the region of resonance, it presents a low impedance path to the amplifier.

Now the speaker can make use of the amplifier's power at low frequencies, because back EMF is reduced. Now input rather than inherent resonance can control the cone. Now extended bass response and accurate transient performance can co-exist beautifully. Now you can enjoy the superb reproduction of the Dual-Drive Woofer in a compact speaker, the Quantum 4.

Is this any way to treat a revolutionary woofer?

In our top-of-the-industry Quantum Line Source, the Infinity-Watkins is the Oscar Peterson of woofers; it can loaf, and still out-perform the rest of the world. We've made it responsible for response only from its phenomenal floor of 18 Hz to an easy 200 Hz.

As used in the Quantum 4, the revolutionary woofer handles a frequency range from 30 through 600 Hz. We give the cone a special treatment that greatly increases the ratio of its stiffness to its mass. This damping treatment eliminates a variety of distortions, circumferential modes and resonances that otherwise could blur the bass and muddy the midbass. And low frequencies from the Quantum 4 are exciting in their combination of clarity with power.

Next up in the Quantum 4 array of drivers is Infinity's high-definition dome midrange driver. In its range from 600 to 4,000 Hz it speakers nothing but the accurate truth. And above all.

EMIT - the eminent exclusive tweeter that stays smooth as high as your ears can reach - and beyond.

Infinity wrote the book on the electrostatic tweeter. It was a story of triumph over adversity. Now we/ve gone the electrostatic on better.

Electrostatics, with their low-mass diaphragms driven uniformly overall, delivered sweet undistorted reproduction of high frequencies. But they were subject to voltage break-down and tended to "beam" sound narrowly.

Our dream of creating a trouble-free magnetic counterpart of the electrostatic became a beautiful reality after we hit on the use of the magnetically powerful rare-earth material called Samarium Cobalt.

now our EMIT - with Samarium Cobalt magnet provides gloriously accurate and musical high-frequency performance minus the limitations of electrostatics, plus nearly perfect horizontal dispersion and high power capability, clear up to a superauditory 32,00 Hz.

EMIT tweeters are used in Infinity speakers. And in no other speakers in the world.

In the Quantum 4 the Dual-Drive Woofer, dome midrange driver, an EMIT, and Infinity's meticulous attention to phasing and crossover technology join together to produce startlingly lifelike stereo imaging and depth.

The sound of a pair of Quantum 4 speakers would be a joy no matter what size enclosures or what price instruments it came from, From compact speakers in the Quantum 4 price range it is a revelation .

specifications

Frequency Response:  35 through 32,000 Hz ± 3 dB 

Horizontal Dispersion:  -2 dB 60°  left and Right (20 kHz)

Minimum Rec. Amp. Power:  30 Watts per channel RMS

Maximum Rec. Amp. Power:  250 watts per channel RMS

Nominal Impedance:  4 Ω 

Drivers

LF :  12" Infinity-Watkins Dual-Drive Woofer

MR:  1-1/2" high-definition dome midrange

HF:  EMIT tweeter

Crossover Frequencies:  600 Hz and 4,000 Hz

Level Controls: Midrange and Tweeters

Dimensions (H x W x D):  910 x 380 x 300 mm (36" x 15" x 12")

Weight )packed):  41 kg (90 lbs)

Finish:  Oiled walnut veneer; removable grille.