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

Technics SA-8500X

The concept is simple. The execution is precise. The performance is outstanding - the name is Technics.
The SA-8500X - first 4-channel receiver with automatic CD-4 separation.

Until now you had to depend upon your hands, your eyes and your ears to bring you 4-channel sepaation CD-4 records. When they missed, so did you.
With the Technics SA-8500X. Instead of trial and error, the SA-8500X brings you automatic and continuous  CD-4 separation.
The SA-8500X has just about everything else you might want for command of 4-channel. Automatic carrier level controls. A CD-4 dmodulator with LSI IC's for discrete 4-channel records. A decoder for both types of matrix. And an MPX output ready for discrete FM broadcasts.

There's also plenty of power; 26 watts per channel minimum RMS, at 8 ohms from 20 Hz to 20 kHz, at 8 ohms from 20 - 20 kHz with no more than0,5% THD.
But equally important, all this power is under your control. With 4 VU meters  for visual conrtol of 4-channel balance. 3 tape monitors.  Clik-stop tone controls.  High and low filter switches. And a 20 dB audio muting switch for reducing sound oudput without changing the volume setting.
We've also put a 4-pole dual-gate MOS and 3 ceramic  IF filters into the FM section. So you get a sensitivity of 1,9 µV (IHF).
For stereo, a simple flick of a switch on the front panel straps the amplifiers together.  Producing 80 watts per channel, minimum RMS. At 8 ohms from 20 Hz - 20 kHz with no more  than 0,5% THD.

The SA-8500X - it's the way to hear everything in 4-channel the way it should be heard. Because it's the first 4-channel receiver with both automatic carrier level controls and automatic CD-4 separation.
Amplifier section
Music Power (IHF):
4-Ch Operation :  260 W at 4 Ω; 180 W at 8 Ω;
2-Ch Operation :  250 W at 8 Ω
Continuous Power (1 kHz RMS):
4-Ch Operation (all channel driven) : 
40 W/40 W/40 W/40 W at 4 Ω
34 W/34 W/ 34 W/34 W at 8 Ω
2-Ch Balanced Transformerless Operation
Both Channels Driven :  85 W/85 W at 8 Ω
Continuous Power (20-20,000 Hz RMS):
4-Ch Operation:
All Channels Driven : 
28 W + 28 W + 28 W + 28 W at 4 Ω
26 W + 26 W + 26 W + 26 W at 8 Ω
2-Ch Balanced Transformerless Operation
Both Channels Driven :  80 W + 80 W at 8 Ω
Total Harmonic Distortion:  0,5%
Intermodulation Distortion (60 Hz : 7 kHz = 4:1, SMPTE) :  0,7%
Power Bandwidth (all ch. driven at 8 Ω):  5 Hz  - 40 kHz -3 dB
Frequency Response:
Phono : RIAA standard curve ±1 dB
Aux :  7 Hz - 70 kHz +0 -3 dB
Residual Hum and Noise: 1,5 mV
Input Sensitivity/Impedance: 
Phono :  2 mV/50 k Ω
Aux :  180 mV/30 k Ω
Playback :  180 mV/30k Ω
Signal-to-Noise Ratio (IHF-A): 
Phono :  70 dB
Aux :  90 dB
Tone Controls:
Bass :  50 Hz ±11 dB
Treble:  10 kHz +10 dB - 10
 Loudness control (Volume at -30 dB):  50 Hz +10 dB
Low :  200 Hz, -6 dB
High :  7 kHz,   -6 dB/oct
Audio Muting:  -20 dB
Rec Out:  180 mV
Damping Factor:  10 at 4 Ω ; 20 at 8 Ω
Load Impedance:
Main or Remote :  4 - 16 Ω
Main + Remote : 8 - 16 Ω
FM Tuner Section
Frequency Range:  88 - 108 MHz
FM Sensitivity (IHF):  1,9 µV
Alternate Channel Selectivity:  66 dB
Harmonic Distortion [mono/stereo]:  0,3%/0,4%
Signal-to-Noise ratio:  65 dB
Frequency Response:  20 Hz - 13 kHz ±1 dB
Image Rejection (at 98 MHz):  55 dB
IF Rejection (at 98 MHz):  60 dB
Spurious Resposne Rejection (at 98 MHz):  60 dB
Capture Ratio:  1,5 dB
Am Suppression :  50 dB
Stereo Separation (at 1 kHz):  40 dB
Leak Carrier (19 kHz, 38 kHz)
Am Tuner Section:  frequency Range :  520 - 1610 kHz
Sensitivity:  20 µV
Selectivity:  25 dB
Image Rejection ( at 1000 kHz) :  40 dB
IF Rejection (at 10000 KHz) :  40 dB
Power Supply:  110 - 120 V, 220-240 V AC, 50/60 Hz
Power Consumption:  360 W
Dimensions (W x H x D):  21-11/32" x 6-3/32" x 15-9/16"
Weight:  37,3 lb

Giussani Research Delta Butterfly One

 The very Hi-End loudspeakers system of reduced dimensions, they are able to offer a true highly dynamic sound in every listening environment.
To facilitate their use in smaller rooms their emission has been optimized both for near rear wall installation and free space.
30° toeing in toward the listening position also facilitates Horizontal NPS© emission.
 Among the exclusive Butterfly characteristics we can point out:
 The proprietary Butterfly© anti-diffraction system.
The front and rear panels professional damping finish.
The exclusive Giussani Research DDELS© (Dual Driver Extended Loading System)
The internal division of the loading volume into two connected triangular sub-volumes Delta System©.
The cabinet totally resonance free, due to Delta System©, lead plates complete internal lining and damping finish.
The total exclusion of any added elements that might introduce a negative effect on acoustic performance (as, among others, a front grille).
The crossover network, electrolytic capacitor free.
The 24 kt gold plated input connectors that allow for both bi-wiring and bi-amping.

System:  3-Ways, bookshelf type
Low-range:  1 Woofer,  8diameter  rubber surround,
Mid-range:  1 Mid-woofer,   8 diameter  rubber surround,
High-range:  1 planar tweeter push-pull neodymium
Crossover:  Linkwitz-Riley/GR (electrolytic capacitors free)
Woofer Loading:  Dual Driver Extended Loading System (DDELS©)
Sensitivity:  87 dB SPL (standard listening conditions)
Nominal Impedance:  4 Ω
Amplifier Maximum Suggested Power:  50 to 250 watt RMS (no clipping) bi-amping
Wiring:  Mono/Bi-Wiring
Dimensions (Wx H x D):  9 ½" x 16" x 13"
Weight:  40 lb
Finish:  Cherry wood (or on demand) and Nextel graphite
Suggested Listening Distance:  >= 5 ft

Rear wall Min/Max distance:  Min = 0 in / Max = according to listening room acoustics

Rotel RX-203A

 AM/FM Stereo Receiver RX-203A Features:
Darlingto direct-coupled OCL complementary power amplifier
Plus-minus split power supply
Direct coupled NF phono equalizer and tone control amplifier
FM IF section with IC ceramic filters
All necessary functions and connection facilities
Extra wide linear FM dial scale Signal strength tuning meter
LED stereo indicator
Facility for 2 pairs of speaker systems
Power Amp Section
Continuous Power Output: 
20 watts per channel min. RMS both channels driven into 8 Ω (from 20-20,000 Hz with no more than 0,5% THD)
24 watts per channel min. RMS both channels driven into 4 Ω (from 20-20,000 Hz with no more than 0,5% THD)
Total Harmonic Distortion (20 - 20,000 Hz) : 
no more han 0,5% (continuous rated power output),
no more than 0,1% 91 watt per channel power output, 8 Ω )
Intermodulation Distortion (50 Hz : 7,000 Hz = 4 : ):
no more han 0,51% (continuous rated power output),
no more than 0,1% 91 watt per channel power output, 8 Ω )
Damping Factor:  40 (20-20,000 Hz , 8 Ω) ±10%
Speaker :  4 ~ 16 Ω (A, B); 8 ~ 16 Ω (A+B)
Headphone :  4 ~ 16 Ω
Pre Amp Section
Input Sensitivity/Impedance: 
Phono [Mag] :  2,5 mV/45 k Ω, (200 pF)
Phono [Ceramic] :  120 mV/240 k Ω
Aux, Tape In :  150 mV/35 k Ω
Aux, Tape In :  150 mV/33 k Ω
Overload Level (max. Input level, THD 0,5%, 1 kHz):
Phono :  120 mV
Aux  :  not less than 5 V
Output Level/Impedance (5 mV Phono Input):
Tape Out :  300 mV/260 Ω
Tape Out DIN :  100 mV /90 k Ω
Frequency Response: 
Phono :  30 - 15,00z Hz ±1,0 dB (RIAA Equalization)
Aux, Tape In :  5 - 70,000 Hz,  +0 -3 dB
Tone Control:
Bass : ±10 dB at 100 Hz
Treble :  ±10 dB at 10 kHz
Loudness Contour:  +7 dB at 100 Hz ; +4 dB at 10 kHz 
Hum and Noise (IHF, short circuited A network, rated power): 
Phono [Mag]:  75 dB
Aux, Tape In :  85 dB
FM Tuner Section
Usable Sensitivity:
Mono :  11,2 dBf (2,0 µV /300 Ω antenna)
Stereo :  39,0  dBf (48 µV/300 Ω antenna)
Usable Sensitivity (IHF '58):  2,0 µV
50 dB Quieting Sensitivity:
Mono :  16,0 dBf (3,5 µV/300 Ω antenna)
Stereo : 39,0 dBf (48 µV/300 Ω antenna)
Signal-to-Noise Ratio (at 65 dBf): 
Mono :  75 dB
Stereo :  65 db
Distortion (at 65 dBf): 
At 100 Hz [mono/stsreo]:  0,2%/0,3%
At 1 kHz [mono/stereo]:  0,2%/0,3%
At 6 kHz [mono/stereo]:  0,3%/0,4%
Frequency Response:  30 Hz to 15,000 Hz +0,2 dB -1,0 dB
Capture Ratio:  4,0 dB
Alternate Channel Selectivity:  50 dB
Spurious Response Ratio:  75 dB
Image Response Ratio:  50 dB
IF Response Ratio:  75 db
AM Suppression Ratio:  50 db
Stereo Separation:  40 dB (at 1 kHz)
Subcarrier Product Ratio:  45 dB
SCA Rejection Ratio:  60 dB
Antenna Input:  300 Ω (balanced; 75 Ω (unbalanced)
AM Section
250 µV/m (IHF, ferrite antenna)
12,5 µV *IHF, ext. antenna)
Selectivity:  25 dB
Signal-to-Noise Ratio:  50 dB
Image Response Ratio:  45 dB
IF Response Ratio:  50 dB
Antenna:  Built-in ferrite loopstick antenna (inside the chassis)
Power Supply:  110-120 V, 220-130 V AC, 50/60 Hz
Power Consumption:  16 watts
Dimensions (W x H x D):  410 x 130 x 280 mm (16-6/32" x 6-1/16" x 11")

Weight:  7,0 kg (15,4 lbs)

Rotel RX-404

 AM/FM Stereo Receiver RX-404 Features:
Direct-coupled Darlington OCL complementary power amplifier
Plus-minus split power supply
Class A operation direct coupled NF tone control amplifier
FM MOS FET front-end for high sensitivity.
FM PLL MPX section
FM LF section with IC, ceramic filters and quadrature detector
Two direct-reading peak power meters
Dual-function tuning meter
Tape monitor
FM muting switch
Stepped volume and bass / treble controls
Loudness switch and subsonic filter (12 dB/oct)
Power Amp Section
Power Output: 
30 watts per channel min. RMS both channels driven into 8 Ω from 20-20,000 Hz with no more than 0,06% THD
34 watts per channel min. RMS both channels driven into 4 Ω from 20-20,000 Hz with no more than 0,06% THD
Intermodulation Distortion (50 Hz : 7,000 Hz = 4:1): 
No more than 0,1% (Continuous rated power )
No more than 0,05% (15 watts per channel power output, 8 Ω)
No more than 0,05% (1 watt per channel power output, 8 Ω)
Total Harmonic Distortion: 
No more than 0,1% (Continuous rated power )
No more than 0,05% (15 watts per channel power output, 8 Ω)
No more than 0,05% (1 watt per channel power output, 8 Ω)
Damping Factor:  40 (20-20,000 Hz 8 Ω)
Pre Amp Section
Input Sensitivity/Impedance: 
Phono :  2,5 mV/47 k Ω
Aux, Tape In :  150 mV/33 k Ω
Overload Level (max. Input level, THD 0,5%, 1 kHz):
Phono :  160 mV
Aux :  not less than 5 V
Output Level/Impedance:
Tape Out :  300 mv/600 Ω
Tape Out (DIN) :  100 mv/90 k Ω
Frequency Response:
Phono :  30 Hz - 15,000 Hz ±0,4 dB (RIAA)
Aux, Tape In :  8 Hz - 45,000 Hz +0,3 -2,0 dB
Hum and Noise (IHF, A-network rated power):
Phono :  75 dB
Aux, Tape In :  85 dB
Tone Cotrol
Bass :  ±10 dB at 50 Hz
Treble :  ±10 dB at 20 kHz
Low Filter (Subssonic):  16 Hz (12 dB/oct)
Loudness Contour:  +10 dB at 100 Hz/ +4 dB at 10 kHz
FM Tuner Section
Usable Sensitivity:
Mono :  10,8 dBf (1,9 µV/300 Ω)
Stereo :  18,8 dBf (4,8 µV)
50db Quieting Sensitivity:
Mono :  16,8 dBf (3,8 µV)
Stereo :  38,2 dBf (44 µV)
Signal-to-Noise Ratio: 
Mono :  70 dB (at 65 dBf)
Stereo :  65 dB
Distortion (65 dBf):
At 100 Hz [mono/stsreo];  0,15%/0,25%
At 1 kHz [mono/stsreo] :  0,15%/0,25%
At 6 kHz [mono/stereo] :  0,25%/0,35%
Frequency Response:  30 Hz to 15,000 Hz +1 -3 dB
Capture Ratio:  1,0 dB
Alternate Channel Selectivity:  60 dB
Spuriouss Response Ratio:  70 dB
Image Response Ratio:  50 dB
IF Resposne Ratio:  65 dB
AM Supression Ratio:  55 dB
Stereo Separation:  40 dB (at 1 kHz); 30 dB (from 50-15,000 Hz)
Subcareier Product Ratio:  55 dB
SCA Rejection Ratio:  60 dB
Antenna Input:  300 Ω (balanced); 75 Ω (unbalanced)
AM  Tuner Section
AM :  250 µV/m
LV :  550 µV/m
Selectivity:  23 dB
Signal-to-Noise Ratio:  45 dB
Image Response Ratio:  38 dB
IF Response Ratio:  40 dB
Antenna:  Built-in ferrite loopstic antenna
Power Supply:  110-120 V, 220-130 V AC, 50/60 Hz
Power Consumption:  220 watts (max)
Dimensions (W x H x D):  430 x 145 x 316 mm (16-15/16" x 5-11/16" x 12-7/16")
Weight:  8,0 kg (17 lbs)

Sony TA-4300F

 High Performance Channel Dividing Preamplifier
Unsurpassed Quality - 24 FET's (Field EffectTransistors) exclusively engineered for high fidelity account for an extremely low distortion of 0.03% at 1V output and high S/N ratio of 85 dB at 1V input.
Simple Dividing of Channels - The original frequency range can be divided into 2 or 3 parts with channel selector screw. With the TAD-43F (optional), 4-channel dividing for tweeter and super tweeter is also possible. With two TA-4300F's, the dividing range can be made into 5 parts.
Precise Selection of Crossover Frequencies - You can simply obtain precise crossover frequencies best fit for the characteristics of your speakers with the crossover frequency selector. In 3 channel dividing, 6 steps between 150 - 1000 Hz for low/mid crossover frequency range and 6 steps between 1,5 - 8 kHz for mid/high crossover frequency range are available. In 2 channel dividing, 12 steps of crossover frequencies between 150 Hz - 8 kHz are also available with switchig of the channel selector screw.
Each crossover frequency consists of NF type filter with the slope of 18 dB/oct.
Advanced Bass Control - Low channel frequency shift switch changes the cut off frequency at low frequency range and compensates the characteristics of speakers. Bass boost level control is provided for bass boost at frequencies below 150 Hz having the slope of 12 dB/oct that boost at 20 Hz up to maximum 18 dB,
Effective Level Controls -  Equalizes the unbalanced efficiency of speakers to attain flat and smooth frequency response throughout.
System:  Negative feedback type filter
Gain:  +0 -1 dB
Crossover Frequency: 
Low :  150, 250, 400, 600, 800, 1000 Hz
High :  1,5; 2,5; 3,5; 4,5; 6; 8 kHz
Output Impedance:  less than 5 k Ω
Input Impedance:  90 k Ω
Within the passband :  less than 0,03%  at 1 V output; 0,1% at 4 V output ,
At the crossover frequency :  less than 0,05% at 1 V outoyt; 0,1% at 2,5 V output
Signal-to-Noise Ratio:  beter than 85 dB at 1 V input (short circuited)
Maximum Input Level:  4,5 V (less than 0,1% distortion)
Frequency Response:  10 Hz - 100 kHz +0 -1 dB
Semiconductors:  24 FET's ; 16 Transistors; 3 Diodes
Power Requirements:  AC 100,117, 220, 240 V 50/60 Hz
Power Consumption:  5 W
Dimensions (W x H x D):  200 x 149 x 316 mm (7-1/8" x 5-7/8" x 12-7/16")
Weight:  3,8 kg (8lb 6 oz)
Supplied Accessories:  Connecting cord RK-74; Polishing cloth

Optional Accessories:  4-channel adaptor TAD-43F

Sony TA-3140F

Power Amplifier Section
Dynamic Power:  
190 watts, both channels opearting at 4 ohms
120 watts, both channels operating at 8 ohms
RMS Power:
50 watts per channel, both channels operating at 4 ohms
40 watts per channel. both channels operating at 8 ohms
Rated Output:  35 watts per channel, both channels operating at 8 ohms
Power Bandwidth:  6 Hz to 35 kHz, IHF
Harmonic Distortion:  less than 0,1% at 1 kHz rated output
IM Distortion:  less thgan 0,1% at rated output
Input Impedance:  100 k ohm
Input Sensitivity (for rated output):  0,85V
Signal-to-Noise Ratio:  better than 110 dB
Residual Noise:  less than 0,01 uW (8 ohm)
Power Consumption:  210 watts
Power Requirements:  100, 120, 220, 240 V AC 50/60 Hz
Dimensions ( W x H x D):  200 x 149 x 320 mm (7-7/8" x 5-7/8" x 12-5/8")
Weight [Net/ Shipping]:  6,5 kg / 7,7 kg (14 lb 5 oz / 16 lb 6 oz)

Onkyo Integra DX-6850

Signal Readout System:  Optical non-cantact
Reading Rotation:  about 500-200 r.p.m. (constant linear velocity)
Linear Velocity:  1,2 - 1,4 m/s
Error Correction System:  Cross interleave Reed Solomon code
D/A Converter:  1 BIT PWM x 2 AccuPulse Quartz System
Sampling Frequency:  352,8 kHz ( eight-times oversampling)
Numer of Channel:  Two stereo
Frequency Response:  2 Hz - 20 kHz
Total Harmonic Distortion:  0,0020% (at 1 kHz)
Dynamic Range:  100 dB
Signal-to-Noise Ratio:  110 dB
Channel Separtion:  110 dB (at 1 kHz)
Wow and Flutter:  below threshold of measurability
Output Level:  2 V r.m.s.
Power Requirement:  110-120, 220-230 V 50/60 Hz
Power Consumption:  21 watts
Dimensions (W x H x D):  445 x 130 x 364 mm (17-15/16" x 5-1/8" x 14-5/16")
Weight:  8 kg (17,6 lbs)

Color Models:  Black or Silver

Harman/Kardon HD-200

System:  Compact Disc Digital Audio
Signal Detection:  3-Beam Semiconductor laser
Error Correction:  CIRC System
Samplig Frequency:  88,2 kHz
Quantization:  16-bit
Channels:  2 Stereo
Frequency Response:  4 Hz - 20 kHz ±0,5 dB
Total Harmonic Distortion:  0,03% (1 kHz)
Dynamic Range:  96 dB
Signal-to-Noise Ratio:  103 dB
Channel Separation:  83 dB (1khz)
Wow and Flutter:  Immeasurable
Line Output Level/Impedance:  2,0 V/10 k Ω
Power Supply:  AC 120 V or AC 220/240 V 50/60 Hz
Power Consumption:  15 Watts
Dimensions (W x H  x D):  443 x 95 x 257 mm (17-3/8" x 3-3/4" x 10-1/8")
Weight:  3,9 kg (8,5 lbs)

B&W Matrix 1

 The B&W Matrix 1 loudspeaker system incorporates the first radical improvement in enclosure design for many years. Invented by Laurence Dickie (B&W Chief Electronics Engineer) it is an ingenious new type of construction, concealed within the loudspeaker cabinet. This unique construction - the B&W Matrix - virtually eliminates cabinet vibrations, which in ordinary loudspeakers add their unwanted contribution to the final sound.
This is a monitor quality loudspeaker system capable of generating extremely high sound levels. At the same time, due to its wide and balanced frequency response, it will faithfully reproduce the quieter sounds of a solo instrument requiering considerably lower sound level for a faithful reproduction of the live performance.
Quite deliberately, the B&W matrix series of loudspeaker are described as digital monitors. They have been designed for the age of the compact disc, with all the additional reqirements that this material places on the loudspeaker system - such as increased dynamic range, increased transient information, lower noise floor, etc.
B&W Matrix 1 is, however, just as mich at home with good analogue material and essentially will faithfully reproduce whatever signals are fed to it.
 The loudspeaker drive units
Having made this major breakthrough in enclosure design, B&W used their ongoing research programme to incorporate totally new drive units within the Matrix series of loudspeakers. For the bass and bass/midrange units, anew material - homopolymer polypropylene - was chosen. A ferrofluid design was employed for the high frequency transducer, giving an additional 8 dB of clear dynamic range for the increased transient signals of the compact disc.

Crossover, filter network and protection circuits
In any product, when the designer improves one module, others have to be upgraded if the whole is to be superior. Take the example of a car for which a new, improved engine is developed; better brakes and suspension must then complement the improved performance from the power unit if the car is to be a totally better product. Likewise with the B&W Matrix series of loudspeakers: having improved both the enclosure and the drive units, corresponding improvements were necessary both in the components and design of the crossover. The APOC protection circuit on which B&W hold world patents, has also been upgraded.
 The B&W Matrix enclosure.
The newly invented Matrix enclosure, on which patent applications are pending throughout the world, is the heart of this loudspeaker and represents on of the few new inventions related to loudspeaker enclosures for many years. The B&W matrix or honeycomb structure which fills tha air space inside the cabinet prevents the enclosure (as opposed to the loudspeaker drive unit) from radiating sound, almost completely. This has never before been achieved.
Frequency Range:  55 Hz - 35 kHz (-6 dB points)
System Resonance:  60 Hz . System "Q" 0,7
Free Field Response:  Listening Axis ±2 dB, 80 Hz - 25 kHz
±30° Horizontal ±2 dB to 10 kHz
±5° Vertical ±2 dB to 20 kHz
Sensitivity:  85 dB (1W, 8 Ω)
Drive Unit:
Bass/Midrange :  150 mm (5-7/8") homopolymer polypropylene cone, 31 mm (1-1/4") voice coil on Kapton former, phenolic bonded and heat cured.
Tweeter :  25 mm (1") Ferrofluid-cooled with laser-optimised polyamide dome.
Distortion (for 90 dB SPL at 1 m):
2an harmonic:  less than 3,0% (20 Hz - 500 Hz); less than 1,0% (500 Hz - 20 kHz)
3rd harmonic :  less than 3,0% (20 Hz - 500 Hz); less than 1,0% (500 Hz - 20 kHz)
Impedance:  modulus 4,5 Ω ±0,5 Ω; Phase ±5° (essentially resistive)
Amplifier Limits:  50 W - 120 W at 4 Ω
Dimensions ( H x W x D):  410 x 230 x 322 mm (16" x 9" x 12-5/8")
Weight:  10 kg (22 lb)

Cabinet Finishes:  Real wood veneers of walnut, black ash, natural oak, rosewood. To special order high gloss lacquered finish within choice of colours.

Sansui SR-3030 BC

 A completely professional two-speed turntable incorporating many of the exclusive features of Sansui SR-4040BC, including the direct belt-drive system and unique anti-howling insulators. Compare its performance figures with those of the SR-4040BC. You'll see that they are minor, and more than offset by the savings this precision component offers. One of the larger differences between the two is the SR-3030BC's unique  Inside Force Canceller, a weight device that opposes the tonearm's natural tendency to cut inward.
This mechanism cheks this tendency for more accurate tracking. The SR-3030BC is an ideal component for use in any medium to large stereo system.
 Accessory Equipment: 
Oil-damped arm lifter controlled by the power switch lever.
Stylus pressure direct-reading scale'
Subweight for use with exceptionally heavy cartridges.
Interchangeable plug-in headshell.
Walnut open-pore wood base  with molded acrylic dust cover.
Drive Motor:  4-pole hysteresis synchronous capacitor starting motor
Speed:  33 and 45 rpm
Turntable Diameter:  12 ¼" aluminum alloy diecast
Signal-to-Noise Ratio:  better than 45 dB
Wow and Flutter:  less than 0,09%
Tonearm:  Static-balance type tubular arm
Tracking Error:  less than ±1°
Stylus Pressure:  0 to 2,5 grams (direct reading gram-scale with ½-gram markings)
Cartridge:  Included Magnet type
Frequency Response:  15 - 20,000 Hz
Output Balance:  less than 1,5 dB
Channel Separation:  better than 30 dB at 1 kHz
Output Voltage:  5 mV
Standard Load Resistance:  50 k Ω
Standard Stylus Pressure:  1,5 to 22,0 grams
Stylus Compliance:  17 x 10¯⁶ cm/dyne
Stylus:  0,5 mils diamond spherical
Power Requirement:  100 V/20 VA, 117 V/19 VA, 230 V/18 VA; 50/60 Hz
Dimensions (W xHx D):  20-1/2" x 6-9/16" x 14-3/4"

Weight:  18,7 lbs

Esoteric P-700

 High-precision mechanism featuring VRDS
In our newl developed Vibration-Free Rigid Disc Clamping System mechanism, the slighty concave turntable is above the disc which is held against it by upward pressure exered by a large-diameter disc clamper, for higher stability. This new disc clamping system, with the disc held tightly between the turnyable which has the same diameter as the disc and a precisely aligned clamper, corrects any  warping or eccentricity of the disc, so that the microscopic pits are always traced accurately by the center beam of the laser pickup. Another advantage of the system is that it minimizes any undesirable vibrations of the disc.

Newly developed floating suspension system for the ultimate stability.
The optical system and the mechanism which supports it are the most important parts of any CD player, and are critical if it is to operate at peak performance. In the CD Drive Unit, the laser pickup drive system uses a newly developed floating suspension which completely isolates it from internal resonance, external vibrations and any influence of external sound pressure, so it can read the digital signals from the microscopic pits with high precision and extreme stability.

High-prcision 3-beam linear tacking laser pickup for ultimate tracking ability.
The 3-beam linear-tracking laser pickup was newly developed to have the lightest possible weight and excellent rigidity. Together with the newly-developed disc clamipng system using a large turntable, it gives the drive an extremely precise pit tracking ability.

High-rigidity dual-construction chassis
The unit has the ideal anti-resonance heavy-weight dual construction chassis. As the shaved-aluminum front panel is combined rigidly with the thick chassis, the overall construction is solid and has superior non-resonationg characteristics. Moreover, since this CD Drive Unit does not incorporate the D/A converter section, it offers extra rigidity; vibrations and mechanical oscillations from the player cannot interfere with the operation of the D/A converter.
Laser Pickup
Type: Optical 3-beam system
Object lens Drive System:  2-dimensional parallel drive
Laser Type:  AlGaAs semiconductor laser
Wavelenght:  780 nm
Pickup Drive System:  Linear-motor drive
Signal Format
Sampling Frequency:  44,1 kHz
Quantization Bits:  16 bits linear/channel
Channel Bit Rate (Transmission Rate):  4,3218 Mb/sec.
Modulation Code:  Eight-to-Fourteen Modulation (EFM)
Error Corection System:  Cross-Interleave Reed Solomon Code (CIRC)
Type:  Compact disc
Playing Time:  Approx. 60 min. for  5-inch;  approx. 20 min. for 3-inch
Diameter:  12 cm (5") and 8 cm (3")
Thickness:  1,2 mm
Scaning Velocity:  1,2 - 1,4 m/sec.
Track Pitch:  1,6 µm
Digital Output Level: 
Coaxial :  0,5Vp-p, 75 ohms
Optical :  -9 dBm
Power Requirements:  120/230 V AC, 50/60 Hz
Power Consumption:  12 watts
Dimensions (W x H x D):  225 x 137,5 x 400 mm (8-7/8" x 5-7/16" x 15-3/4")
Weight:  7 kg (15,5 lbs)
Remote Control Unit:  RC-385

Denon DP-S1

 The DP-S1 is a top quality CD transport developed based on a ploicy of fully eliminating vibration and resonance within an innovative design. Vibration and resonance are eliminated through a newly developed pickup mechanism, a large stabilizer, triple-layer floation, and a frame design which keeps the influence of external acoustic pressure to the absolute minimum. The DP-S1 provides five types of digital outputs and an ultra high-speed synchronous optical link (ST-GEN LOCK) for ultimate synchronized driving.

Newly developed pickup mechanism unit
Strong cast aluminum pickup base throughly eliminates extraneous vibration.
A high torque motor provides accurate, extremely smooth rotation, minimizing jutter, in addition , the self-centering stainless steel turntable is driven with an ultra-thick spindle shaft (6mm in diameter), and a very hard, low friction ruby (5mm in diameter) is used for the bearing, providing outstandingly high endurance.
The opening of the disc loading section is air-shielded with a special rubber material to suppress the effect of air vibration entering through gaps, greatly improving the airtightness of the pickup mechanism.
 Extremely stable disc playback thanks to a large stabilizer
The stabilizer holds the disc down to correct any warping in the disc and prevent jitter during signal readout.
The stabilizer also thoroughlysuppresses any resonance inthe disc itself.
The moment of inertia generated by the stabilizer, which is heavier than disc, creates extremely stable rotation and improves the readout jitter margin.

Through anti-resonant construction
The latge insulator absorbs vibrations from the floor through a combination of aluminum and sintered alloy.
The mechanissm base which supports the pickup mechanism is floated from the frame with elastic rubber.
The pickup mechanism is itself floated with an oil damper and spring. This Triple Floating Mechanism structure shuts out external vibration to provide playback with excellent vibration resistance.
The highly rigid pickup  mechanism is palced at the center where it is less likaly to be affected by external vibration. This also makes for excellent weight distribution.
The heavyweight chassis and lowcenter of gravity create an ideal non-resonant design.
The design makes use of spherical surfaces and radial forms to keep the influence of external acoustic pressure to a minimum
 Synchronized driving with an ultra high speed synchronized optical link (ST-GEN LOCK)
The speed at which date transfer is a very rapid 50Mb/sec, nearly 10 times that of conventional optical links (6Mbit/sec). This virtually eliminates transmission distortion due to signal delay.
The D/A converter master clock is synchronized with the CD Transport clock improving clock precision and suppressing  jitter.
The AT&T ST-Link system is used for the interface, allowing direct one way connection to high quality foreign made D/A converters.
Disc Format:  Compact disc
Signal Format
Sampling Frequency:  44,1 kHz
Quantization Bits;  16 bits linear/channel
Transmission Baud Rate:  4,3218 Mb/sec
Digital Output Signal Format
Format :  Digital audio interface
Peak Optical Power:   -16 dBm or greater
Acceptable Laser Wavelength:  875 nm
Peak Optical Power:  -12 dBm
Acceptable Laser Wavelength:  660 nm
Output Voltage:
Coaxial - RCA :  0,5 Vp-p/75 Ω
Coaxial - BNC :  0,5 Vp-p/75 Ω
Balance :  5,0 Vp-p/110 Ω
Digital Input Signal Format
Gen Lock Clock Input -ST
Acceptable laser Power:  -30 dBM or greater
Acceptable Laser Wavelength:  875 nm
Signal Format :  16,9344 MHz (384 fs,) Duty 50% clock
Pickup Type:  Reflex lens drive optical pickup
Reflex lens Drive Method:  Two-dimensional parallel driving
Light Source:  Semiconductor laser
Wavelength : 780 nm
Power Supply:  110 V - 240V, 50/60 Hz
Power Consumption:  17 W
Dimensions (W x H x D):  434 x 143 x 400 mm (17-3/32" x 5-40/64" x 15-3/4")
Weight:  16,7 kg (3l lbs 14 oz)

Year:  1993