What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Infinity Reference Series 41i

Infinity Reference 41i
The three-way bookshelf model in the Reference Series offers gold-plated five-way binding posts and incorporates APG cone technology in all three drivers. The 210 mm woofer and 130 mm midrange utilize graphite-coated APG cones for lower moving mass and the 25 mm tweeter's textile dome is APG-coated. The tweeter's catenary profile provides maximum stiffness at the tip of the dome for nearly perfect pistonic motion with no out-of-phase break-up at the tip.
With three drivers, including the ferrofluid cooled tweeter, the Reference 41 i is capable of enhanced power handling for higher maximum sound pressure levels at no compromise in sound quality.

Model:  Reference 41i
Frequency Response: 40 Hz - 25,000 Hz, (±3 dB)
Crossover:  400 Hz / 3 kHz
Sensitivity (2,83 V / 1m):  92 dB
Nominall Impedance:  6 Ω
Power Handling:  20 - 125 watts
High Frequency:  Tweeter  25 mm
Mid Frequency:  Midrange 130 mm
Low Frequency:  Woofer 210 mm
Vinyl Cabinet Finish:  Chatsworth Oak/ Black Ash
Dimensions (HxWxD):   600 x 274 x 276 mm

Mordaunt-Short Festival series 2

Festival Series 2
Comprising the DSB 208 bass-and mid-frequency transducer and a dome tweeter whose upper response extends smoothly beyond audibility, the Festival Series 2 is a sensitive, versatile, high -performance system of exceptional "musicality".
With its extended bass response, high power handling and low distortion, the festival Series 2 is therefore as eminently suitable for use in sophisticated high power installations as in smaller or more limited systems.

System design - compact, infinite baffle enclosure. For use shelf-mounted horizontaly or verticaly
Cabinet - 15 mm high-density board construction. Sides wood-veneered with internal balancing veneers; rear spray-finished neutral fleck.
Grille - acoustically transparent, deep brown woven fabric on 9 mm board frame with nylon stud fastenings.
Cabinet finish - selected teak or walnut veneer.
Transducers - DSB for bass/mid frequency and for high-frequency 19 mm wide dispersion synthetic dome
Dividing network - high grade, ferrite core inductors and low-loss, close-tolerance capacitors on printed circuit board.
Electrical connection - terminal moulding incorporating both standard DIN socket and spring-loaded push-button connectors for stripped wire ends. Plugs and leads supplied.

Nominal Frequency Range:  35 - 25 ,000 Hz
Specific Frequency Response:  75 - 20,000 Hz  ±3 dB
Impedance:  8 Ω nominal
Sensitivity:  6,7 V RMS (5,6 watts) to produce 96 dB/1m in anechoic conditions using pink noise.
Maximum Sound Pressure Level:  109 dB in typical listening room
Continous Power Compatibility:  10-90 watts per channel. Amplifiers of higher power may be used with care.
Distortion:  Substantia;;y lesss than 1% Total Harmonic Distortion within frequency range 150-25,000 Hz at 6,7V rms input (nominal 96 dB sound pressure level)
Fundamental System resonance:  75 Hz
Dividing Frequency:  3,500 Hz
Filter Characteristics (less tahn 0,1% Total Harmonic Distortion throughout entire frequency range at maximum input):
Low Pass :  12 dB/oct
High pass :  18 dB/oct
Dimensions  (H x W x D):  455 x 280 x 185 mm ( 17-7/8" x 11" x 7-1/4")
Weight :  6,4 kg (14 lbs, 1 oz ) single speaker unpacked

Arcam Alpha 2 amplifier

The improvements that have been taking place in turntables, CD players, and loudspeakers demand a new level of performance from the amplifier - the heart of every hi-fi system. The discerning buyer expects that today's amplifier should combine a natural yet dynamic and powerful sound quality with good looks and ease of operation. above all, the amplifier's standard of manufacture and quality control should promise years of consistent, trouble free performance.
Until now, only a handful of designs were able to meet all of these stringent criteria. Unfortunately the prices of amplifiers in this select group often made them incceassible to those on a limited budget. Arcam, recognising this unfulfilled demand, has now designed and produced  a modern, top quality amplifier that is truly affordable - the Arcam Alpha 2.
Offering many of the sonic benefits of more expensive models, the Arcam Alpha 2 would be regarded as a fine amplifier at any price. However, when its outstanding performance, facilities and construction are compared with other amplifiers at its price level, it is clear that the Alpha 2 is destined to become a classic, setting the new standards by which all others will be judged.

The Arcam Alpha 2 is a product of Arcam's many years of experience in amplifier design and manufacture. Detailed theoretical analysis and extensive listening have produced a design that is technically outstanding. This design has been realised in practice using high quality components selected for optimum electrical and sonic performance. The result is an amplifier that maintains the full dynamics of a musical performance while reproducing the subtleties and emotion both accurately and naturally.
Not only does the Alpha 2 produce a generous 30 watts continuous output per channel into 8 ohms,  but its special high peak current output stage will drive loudspeakers whose impedance dips as low as 2 ohms. Unlike many other amplifiers the Alpha 2 can be run continuously at high levels because its coolrunning aluminium chassis will not overheat.
As well as working properly with all commonly available loudspeakers, the Arcam Aplha 2 is fully compatible with a wide variety of programme sources. Five inputs are available; four are selected by a rotaty switch and the fifth by the nearby tape monitor button. all the inputs use a high quality and robust design of phono socket.
The Alpha 2's cartridge input is specialy optimised for use with any moving magnet cartridge or high output moving coil cartridge. The highest quality low output moving coil cartridges can also be accommodated using our optional plug in MCA pre-pre-amplifier board.
There is a dedicated input for a CD player, further inputs for a Tuner and Video playback and finally a set of line level input and output sockets suitable for use with a tape recorder.
A quality domestic hi-fi amplifier can and should possess those genuinely useful facilities which can improve the performance of the complete system. Typical of Arcam's attention to detail is the Alpha 2' volume control which has been psychoacoustically designed to allow ease of adjustment at the low volume levels often used in the home. limited range bass and treble controls of advanced design are also provided. These allow precise adjustment of the frequency extremes without coloration of the critical midfrequency band. Used sensibly they can help correct for imperfections elsewhere in the system, particularly those associated with cartridges and loudspeakers. The constant power law balance control also helps in this respect. The tone and balance controls all have a centre click stop to provide a reference response in the centre position.
The Alpha 2 has a front pabel socket which will suit a wide variety of stereo headphones. The headphones and loudspeakers will normally work together as the main loudspeaker sockets are wired directly to the amplifier's output to obtainthe best possible sound quality. However  a second pair of loudspeaker socket is also fitted enabling the loudspeakers to be muted automatically whenever headphones are plugged in.

Electronic Design
The disc pre-amplifier uses a low noise professional IC and employs audiophile grade 1% metal film resistors and polypropylene capacitors in the critical RIAA equalisation network. This ensures a clean, accurate sound.
Uniguely the Alpha2 is also configurated to accept out plug in moving coil cartridge pre-pre-amplifier board, the MCA. The MCA and Alpha 2 combination has a much lower noise level and correspondingly greater fidelity than other similarly priced amplifiers. This allows the Alpha 2 to be used successfully with some of the world's finest MC cartridges.
All other inputs are fed directly to the Alpha 2's volume control to ensure a virtually infinite overload margin. The preamplifier stages which follow the volume control again employ low noise professional quality ICs and make minimal use of coupling capacitors to avoid degradation of the sudio signal. All preamplifier circuits are powered by two lownoise, low-impedance regulated power supplies.
The Arcam Alpha 2's power amplifier is an advanced bipolar, high slew-rate design with direct coupled fully complementary class AB output stages. Constant bias circuitry for the driver transistors maintains a clean, dynamic output throughout the entire operating range. The amplifier has a very high transient current capability, made possible by use of 100 watt power transistors combined with high value low ESR reservoir capacitors and a generously rated toroidal mains transformer. Together these permit instantaneous peak output levels of some 250 watts from a single channel into a 2 ohm load. Nevertheless the amplifier is effectively protected against overload. readily accessible fast-blow output fuses are also fitted for loudspeaker protection. They are connected within the main  feedback loop to prevent degradation of the signal. In addition the layout of the PCB has been optimised for such factors as maximum transient power capability and minimum on-board interaction.
Finally, the loudspeaker outputs use ultra high quality PCB mounted 4 mm sockets. These employ silver loaded contacts amd are soldered directly to the PCB to ensure integrity of the signal path. High quality matching plugs are supplied as standard.

Output Power: 
30 W  - both channels into 8 ohm (20 Hz - 20 kHz at 0,5%THD)
40 W  - single channel at 1 khz into 8 ohm
60 W  - single channel at 1 khzinto 8 ohm
Total Harmonic Distortion:  0,02% (at 25 W into 8 Ω at 1 kHz)
Overload Margins: 
Disc Inputs :  32 dB at 1 kHz
Other Inputs :  50 dB
Frequency Response:
Disc Input :  60 HZ - 20 kHz , ±0,5 dB, -3 dB at 20 Hz
Other Inputs :  30 Hz - 20 kHz ±0,5 dB, -1 dB at 20 Hz
Tone Controls:
Bass :  +-8 dB at 50 Hz
Treble :  +-8 dB at 15 kHz
crosstalk:  -65 dB at 1 kHz
Disc Inputs:
Suitable for MM and high-output MC cartridges
Sensitivity :  2,5 mV
Noise :  -72 dB
impedance :  47 k Ω  in parallel with 100 pF
With MCA board fitted, for low output MC cartridges
Sensitivity   250 µV
Noise :  -70 dB
Impedance :  330 Ω
Tuner, TApe, Video :
Sensitivity :  200 mV
Noise :  -95 dB
Impedance :  25 k Ω
Sensitivity :  450 mV
Noise :  -95 dB
Impedance :  10 k Ω
Outputs Nominal Level/Impedance
Tape :  220 mV/2 k Ω
Headphones :  suitable for 8 Ω  - 2 k Ω  impedance
Loudspeaker:  30 W into 8 Ω  at 1 kHz
low frequency daming Factor :  200
Suitable for speaker of 4 Ω  or higher nominal impedance
Power Supply:  240 V , 110 V ; 50/60 kHz
Power Consumption :  120 VA
Spares Provided
Two loudspeaker fuses;
Two red and two black 4 mm plugs
Dimensions (W x H x D):  430 x 230 x 84 mm (16,9" x 9,1" x 3,3")
Weight:  4 kg (8,8 lbs)

Sony PS-X70 turntable

Consider the Sony Audio PS-X70 turntable. Think of it as a professional transcription turntable, for home use. At a price your audio conscious home can afford.
Think about two discrete servo-controlled motors. One for the platter, another for the tonearm.
And while you're thinking about Sony's hesitation-free BSL motor. No brushes. No slot. And absolutely no cogging. Just even, iniform rotation. Hour after hour. Year after year.
Our own quartz-locked magnedisc servo control system makes Sony direct-drive turntables immune to voltage fluctuations. It takes servo control to a new level of accuracy, by measuring turntable speed at the outer rim of the platter - not at the motor.
There's more you sholuld know; front-mounted feather-touch controls, electro-magnetic braking, special four-clamp head-shell connector, even resonance-free SBMC cabinet with flui-filled feet to eliminate acoustic feedback.

But perhaps the most amazing thing about our PS-X70 is that it's not alone.
It's just the top of our line. A whole line of new Sony Audio turntables, most of which have most of the features we've listed here.
And every one is designed as a system. With electronic, megnetic, and mechanical technologies contributing to a balanced level of audio performance no single innovation could achieve. We know about turntable innovation. We paractically wrote the book. Direct drive, servo control,Quartz lock, carbon fiber tonearm, Sony gave you then all. Long before almost anyone knew they existed. But we also know that innovation alone can't make a great audio component. Sound makes a great audio component.

Platter:  320 mm (12-5/8") aluminumalloy diecast
Motor:  DC servo-controlled linear BSL motor
Drive System:  Direct-drive, crystal lock control system
Speed:  33-1/3 and 45 rpm
Speed Control Range:  ±10% (crystal lock off)
Starting Characteristics:  comes to nominal speed within a 1/4 revolution (33-1/3 rpm)
Wow and Flutter:  ±0,045% DIN; 0,025% WRMS
Signal-to-Noise Ratio:  75 dB (DIN B)
Initial Drift:  within 0,0003%
Load Characteristics:  0% up to 230 g tracking force
Automatic System:  lead-in, return, reject, repeat
Type:  Statically balanced Universal
Pivot-to-Stylus Length:  235 mm (9-1/4")
Overall Arm length:  330 mm (13 ")
Overhang:  14 mm (9/16")
Tracking Error:  +2°27',  -1°30'
Tracking Force
Adjustment Range:  0 -2,5 g
Shell Weight:  11 g
Cartridge Weight Range:  11,0 - 19,5 g
Including Shell :  19,0 - 27,5 g (with wxtra weight)
Power requirements:  220, 240 AC adjustable 50/60 Hz ; 120 V Ac 60 Hz
Power Consumption:  16 W
Dimensions (W x H x D):  480 x 165 x 420 (18-15/16" x 6-1/2" x 16-9/16")
Weight:  13 kg (28 lb 11 oz) net

Pioneer PL-12D

With this well-made stereo turntable, Pioneer proves once again that quality and parcticality are synonymous. The budget-prieced PL-12D gives you more for your stereo investment than you'd ever expect. A fine synchronous motor that helps cut out audible wow and flutter. An extremely steady belt-drive. An anti-skating control to lessen distortion. A cueing device with simultaneous movement with the start lever. And a beautifully-balanced S-shaped tonearm with plug -in type lightweight head-shell. For the man about to make his first investment into stereo components, the PL-12D becomes more than a budget investment but a truly professional turntable that will serve him well for many years of quality sound reproduction.
 Drive Motor Section
The Pl-12D employs a 4-pole synchronous motor and a belt-drive system to ensure stable rotation of the turntable platter that is free from line voltage fluctuation. The synchronous motor is much like the motors usually used only in expensive turntables, and is the quietest that you can own. It gives you an extremely high Signal-to-Noise ratio, extremely low wow and flutter, and helps cut down on irritating motor vibration

Tonearm Section
The tonearm of the PL-12D is the static-balanced, S-shaped type that uses a super hard alloy material aat the pivot point of its arm, thereby assuring sesnsitive, stable tracking at all times. The counter weight of the tone arm is the stylus pressure direct reading type that gives easy weight adjustment when cartridge-changing is necessary. Then there is a lightweight plug-in type headshell so that you may use a cartridge with its stylus pressure from 0,75 grams. To cut down on distortion, the PL-12D has an anti-skating control to suppress the harmful inward force of the stylus.

Other Distinctive features
The cueing control an oil-damped arm elevation device, is connected to the start lever and helpd prevent damage to your stylus or your record usually caused by misoperation. There is a stylus position gauge to facilitate easy installation of your favorite cartridge. And Pioneere used aluminum foil on the inner part of the Pl-12D's wooden cabinet to prevent external noise often caused by yoour amplifier or other equipment placed near the turntable. The cabinet itself elegantly styled is the spring-suspension type and designed to cope with external vibraation. The dust cover of the Pl-12D is hinged in the free-stop manner, permitting you to leaave it at rest at any angle you choose.
Motor:  4-pole synchronous motor
Drive System:  Belt-driven
Speed:  33 and 45 rpm
Turntable Platter:  300 mm (12") zinc die-cast turntable
Platter Weight:  1,2 kg (2 lb 10 oz)
Signal-to-Noise Ratio:  better than 47 dB
Wow and Flutter:  less than 0,1% (WRMS)
Tonearm:  Static-balanced type S-shaped
Arm Effective Length:  221 mm
Overhang: 15,5 mm
Max.Usable Cartridge Weight;  10 grams
Power Requirements:  110 - 130 V, 220 - 240 V, AC 50/60 Hz
Power Consumption:  11 Watts
Dimensions (W x H x D):  430 x 164 x 362 mm (16-15/16" x 6-15/32" x 14-1/4")
Weight:  7,4 kg (16 lb 5 oz)

Sony TA-70 amplifier

Integrated Stereo Amplifier
A compact amplifier at a sensible price incorporating all the features necessary to form the centre-piece of a complete hi-fi system. Designed for combination with the ST-70 tuner.

This integrated stereo amplifier, model TA-70 combines performance with economy. A sensibly priced unit which has been designed with all the experience that has made Sony world famous for quality in hi-fi. Features include, selector for magnetic or ceramic cartridge, tape/source monitor switch, headphone jack, DIN connector socket, high filter switch and facilities for SQ quadrophonic sound by connecting model SQA-200 decoder amplifier.
Styled to match stereo tuner ST70, model TA70 is surely a sound investment.
Rated Output:  8 watts per channel, both channels operating load 8 Ω at 1 kHz
Power Bandwidth:  30 Hz - 20 khz
Total Harmonic Distortion: 5% at rated output power
Inputs Sensitivity/Impedance:
Phono 1 :  3,5 mV/50 k Ω
Phono 2 :  300 mV / 1 m Ω
Tuner :  250 mV/100 k Ω
Aux :  250 mV/100 k Ω
Tape :  440 mV/100 kk Ω
Rec/Pb :  440 mV/100 k Ω
Outputs Level/Impedance
Rec Out :  250 mV/10 k Ω
Rec/Pb :  30 mV/80 k Ω
Tone Controls:
Bass :  100 Hz ±10 dB
Treble :  10 kHz ±10 dB
Loudness Control :  100 Hz + 8 dB; 10 kHz =4 dB ( att -30 dB)
Filter : 
High :  3 dB/oct above 5 kHz
Circuit System:  Quasi-complementary symmetry circuit
SEPP OTL:  amplifier
Semiconductors:  20 Transistors; 2 Diodes
Power Requirements:  AC 240 V 50 Hz
Power Consumptions:  70 watts
Dimensions (W x H x D):  330 x 87 x 245 mm (13" x 3-1/2" x 9-7/10")
Weight:  2,8 kg (8 lb 6 oz)

Sony ST-70 tuner

AM/FM Stereo Tuner
A stereo tuner offering many facilities normally found inn more expensive models. It provides for a reasonable price the additional dimension of a stereo radio to your hi-fi system.

An incredibily compact AM/FM stereo tuner offering facilities normally found inn more expensive models. These include MPX decoder for FM stereo, AFC switch, tuning meter, stereo indicator ligt, built-in AM/FM aerials and external antenna terminals for AM/FM.
For clarity, purity , and economy model ST-70.
FM Tuner Section
Tuning Range :  87,5 - 108 MHz (3,43 - 2,78 m)
Aerial Antenna:  300 Ω balanced
Intermediate Frequency:  10,7 MHz
Sensitivity:  2 µV, (s/n30 dB)
Signal-to-Noise ratio:  65 dB
Capture Ratio:  4 dB (IHF)
Image Rejection:  40 dB (IHF)
IF Rejection:  90 dB
AM Suppression:  45 dB
Frequency Response:  20 -15,000 Hz ±3 dB
Harmonic Distortion : 
Monaural :  0,5% at 400 Hz
Stereo :  1,0 % at 400 Hz
Stereo Separation:  35 dB at 400 Hz
AM Tuner Section
Tuning Range:  530 -1605 kHz (566 - 187 m)
Aerial:  Built-in ferrite bar aerial and external aerial terminal
Intermediate Frequency:  469 kHz
Sensitivity MW:  48 dB/m built-in aerial, 20 µV external aerial
Signal-to-Noise Ratio:  50 dB
Output Level:
High :  2 V
Normal :  750 mV
Circuit System:  FM/AM superheterodyne tuner
Semiconductors:  14 Transistors;  1 FET; 15 Diodes
Power Requirements:  AC 240 V 50 Hz
Power Consumption:  8 watts
Dimensions (W x H x D):  330 x 87 x 245 mm (13" x 3-1/2" x 9-7/10") including projecting parts
Weight:  2,8 kg (6 lb 2 oz)

Onkyo TA-2040

Stereo Cassette Tape Deck
This front loading cassette deck has everything needed to produce excellent sound; Onkyo's S&S sendust Rec/Pb head for metal tapes, a bright, long life flourescent display for precise and instantaneous level readings, Dolby NR, phase-locked loop, FG-servo DC motor drive system, auto-stop circuitry, soft-touch controls, and a remote control socket for use with the Onkyo RC-5 unit.

Track System:  4-track, 2-channel stereo
Recording System:  AC bias
Erasing System:  AC erase
Tape Speed:  4,8 cm/sec
Wow and Flutter:  0,055% (WRMS)
Frequency Response:
Normal Position :  20 -15,000 Hz
High Position :  20 -17,000 Hz
Metal Position :  20 - 19,000 Hz
Signal-to-Noise Ratio (Dolby NR out, 60 dB, Metal Position Tape) A noise reduction of 10 dB above 5 kHz and 5 dB at 1 kHz is possibile with the Dolby NR In
Input Jacks:
Microphone Jacks :  2
Minimum Input Level/ Impedance :  0,3 mV/5 k Ω
Optimum Mic Impedance:  200 Ω - 50 k Ω
Line In :  2
Minimum Input Level/Impedance :  50 mV/50 k Ω
Line Out :  2
Output Level :  0,480 V (at 0 dB)
Output Impedance :  over 50 k Ω
Headphone Jack :  1
8 Ω / 200 Ω
Motor :  FG Servo DC Motor
Heads:  Sendust head
Components:  43 Transistors;  19 Diodes; 8 IC; 5 LED
Power Supply:  AC 110.120.220,240 V 50/60 Hz [AC 240 V  50 Hz or 120 V 60 Hz, AC]
Power Consumption:  25 W
Dimensions (W x H x D):  418 x 120 x 330 mm (16-7/16" x 4-3/4" x 13")
Weight:  6,4 kg (14,1 lbs)

Optonica RP-105H turntable

Optonica RP-105H
Fully-automatic Stereo Turntable with Double Direct Drive System
For superior performance, greater reliability and easier operation, electronic control systems are used throughout the RP-105H. Separate direct drive platter and tonearm motors assure extrastable platter rotation plus maximum tonearm trackability. An electronic servo control maintains platter speed precision, while a microprocessor controls the operation of the tonearm. When the unit is turned off, a solenoid supports the tonearm and locks it in place. Electronic control systems are also used to protect the stylus in case of power failure and to handle cuieing operations. The RP-105H also features remote control mode selection plus play/cue functions. The stylus is protected and extra operating procedures are eliminated by the auto record size/presence detector.

Type:  full-automatic
Motor:  FG Servo motor
Drive System:  Direct-drive system
Turntable Platter :  aluminum die-cast
Platter Diameter:  300 mm
Speed:  33-1/3 and 45 rpm
Speed Control Range :  ±4%
Wow and Flutter:  ±0,06% (DIN 45 500);  0,04% WRMS (JIS C-5521)
Rumble:  47 dB (DIN A);  65 dB (DIN B)
Tonearm Type:  Static-balanced S-shaped tonearm
Effective length:  215 mm
Overhang:  16 mm
Off-Set-Angle:  23°
Cartridge Weight Range:  4 - 10 g
Stylus pressure Range:  1 - 3 g
Type:  Magnetic type
Output Level:  7 mV
Frequency Response:  20 Hz - 20 kHz
Channel Separation:  20 dB
Channel Balance:  3 dB
Recommended Load Impedance:  47 k Ω
Weight:  4,5 g
Recommended Stylus Pressure:  2 g
Power Source:  110, 20, 240 V 50/60 Hz AC
Power Consumption:  10 W
Dimensions (W x H x D):  430 x 120 x 355 mm
Weight:  7 kg

Optonica RT-105H Tape-Deck

Optonica RT-105H
Stereo Cassette Tape-Deck with Microcomputer Full Logic Control System
Greater reliability and convenience in the transport system of the RT-105H are brought about by digital control technology. A microcomputer-controlled full logic system not only makes operation easier for you, it also makes it easier on the deck's transport mechanism through soft-touch control and direct switching of modes. APSS is provided for one-touch skipping or repetition of desired selections, while the auto space control uses digital circuitry for the insertion of blank spaces between songs. A high-performance hard permalloy head ensures optimum performance with all types of tapes, including metal. Performance and convenience are further assured with Dolby Noise Reduction circuitry, full-function remote control and peak level meters.

Motor:  Electronically-controlled DC motor for reel drive
Record/Playback :  hard permalloy
Erase :  Double-gap ferrite
Wow and Flutter:  ±0,20% (DIN 45 500);  0,07% WRMS
Tape Speed Deviation:  ±2%
FF/REW Time :  10 sec (C-60)
Frequency Response:
Normal Position :  40 - 13,000 Hz (±3 dB); 40 - 14,000 Hz (DIN 45 500)
CrO₂ Position :  40 - 15,000 Hz (±3 dB);  40 - 16,000 Hz (DIN 45 500)
Fe-Cr Position :  40 - 15,000 Hz (±3 dB):  40 - 16,000 Hz (DIN 45 500)
Metal Position :  40 - 16,000 Hz (±3 dB): 40 - 17,000 Hz (DIN 45 500)
Signal-to-Noise Ratio (Fe-Cr Tapes):
Dolby NR off :  56 dB
Dolby NR on :  66 dB at over 5 kHz
Recording System:  AC bias (105 kHz)
Erase System:  AC erase (105 kHz)
Input Sensitivity/Impedance:
Mic :  0,2 mV/ 6,8 k Ω
Line -In :  50 mV/ 50 k Ω
Rec/Pb (DIN) :  0,2 mV/ 6,8 k Ω
 output Level/Impedance:
Line-Out :  550 mV/50 k Ω at 0 dB
Rec/Pb (DIN) :  550 mV/50 k Ω at 0 dB
Headphones :  40 mV/ 98 Ω at 0 dB
Power Source:  110, 220, 240 V 50/60 Hz  AC
Power Consumption:  25 W (at 220 V)
Dimensions (W x H x D):  430 x 95 x 320 mm
Weight :  5,9 kg
Remote Control :  Yes

Cerwin-Vega AT-60

System:  3-way, bass-reflex, floor-standing
Drive Units:
Low Frequency :  1 x 300 mm paper cone
Mid-frequency :  1 x 130 mm paper cone
High Frequency :  1 x 25 mm mylar tweeter
Crossover :  400 Hz, 3000 hz
Frequency Response:  30 - 22,000 Hz
Nominal Impedance:  6 Ω
Sensitivity:   96 dB (at 1 m /1 W)
Distortion:  0,5% (mid-frequency a 96 dB/1m)
Amplifier Requirements:  5- 150 watts
Internal Volume:  90 litres
Finishes:  Walnut antiscetch vinyl
Grille:  Brown acoustic transparent
Dimensions (H x W x D):  720 x 415 x 320 mm
Weight:  22 kg net

KEF Model 104aB

Designed to be positioned vertically on a speaker stand, Model 104aB is a further development of the highly acclaimed Model 104, where "aB" was an abbreviation for "acoustic Butterworth", relating to the shape of the acoustic response of the midrange and treble drivers in the crossover region.
The new network was designed by computer and in  combination with the t27 it gives a close approach to a theoretical third order Butterworth response. A comparasion of measured and theoretical responses shows that sound output remains within ±1 dB of the ideal curve over most of the frequency range from 500 to 20,000 Hz. Likewise the phase response is very nearly perfect. KEF engineers have called the new circuit an acoustic Butterworth (aB) filter network.

The aB section has three functions:
1 - To compensate for the high frequency roll-off due to voice coil inductance.
2 - To exactly compensate for the Q and impedance of the drive unit at this fundamental response frequency.
3 - To provide terminal volts on the drive unit for a constant voltage input, which vary with frequency in such a way that the acoustical frequency response corresponds to that of a third order Butterworth high pass filter.

The effect of the modification is immediately audible as a marked reduction in colouration and is particularly beneficial in the reproduction of voices and stringed instruments.
The improvement in transient response gives increased depth perspective and much sharper imaging when reproducing stereophonic signals.

To achieve an extended frequency response from a compact cabinet without loss of efficiency. Model 104aB incorporates a 13" x 9" bass radiator acoustically coupled to an 8" bass unit. Operating in phase below 45 Hz the two units combine to offer the equivalent radiating area of a 15" bass unit. All this from an enclosure just 13' wide. This system is rated to handle 100 watts on normal musical programme and the high frequency unit is protected by a fuse against fault conditions such as switching transients and high speed spooling.
Model 104 loudspeaker systems may be upgrated to Model 104aB specification using the Model 104 modification kit which  is available from KEF dealers.

System:  2-way, stand-mount with passive radiator
Drive Units:
Low Frequency :  1 x B200 bass unit (Sp1039); 1 x BD139 passive radiator (SP1042)
Highh Frequency :  T27 tweeter (SP1032)
Crossover :  SP1065
Rated Max. Power:  100 watts programme
Frequency Response:  50 - 20,000 Hz ±2 dB
Nominal Impedance:  8 Ω
System Resonance:  35 Hz mechanical reflex
Dividing Frequencies:  45 Hz and 3,000 Hz
Sensitivity:  12,5 watts for 96 dB (at 1 m and 400 Hz in anechoic conditions)
Amplifier Requirements:  15- 100 watts into 8 Ω
Internal Volume:  35,5 litres
Finishes:  Walnut or Teak
Grille:  Black foam
Dimensions (H x W x D):  630 x 330 x 260 mm (24,8" x 13" x 10,2")
Weight:  16,3 kg (36 lb ) net