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

Micro Seiki MA-707

Low mass type dynamic balance tonearm.
The MA-707 is a newly developed dynamic balance tonearm featuring superb tracking due to the light stylus force. And the low effective mass perfectly matches the characteristics of high-compliance type cartridges. Another feature is the rigid yet light aluminium alloy used in the pipe part of the arm. The internal lead wires are actually tiny coaxial cables. Hard gold plating of the headshell terminals and plug-in type construction assure perfect conductivity. The unique dynamic balance system has been made practical due to the spring system (patent pending) using a torsion bar. Linearity is outstanding even with extremely light stylus force.
Even with low-compliance type cartridges, the correct balance can be obtained by adding weights to compensate.

A complete solution to the problems of the dynamic balance system.
There are few dynamic balance type tonearms in the market even though this type is said to be ideal. One reason is the precision required for the spring built into the dynamic balance system. The weak points are the difficulty of maintaining spring linearity at light stylus forces and loss of tension with the passage of time. The MA-707 uses a precision spring developed through strict selection of materials and high precision processing. These problems have been completely solved by the use of a torsion bar. Stylus force change is extremely linear from 0,3 to 3,0 grams, by 0,1 gram step. Tracking is extremely sensitive at low stylus forces, with high compliance type cartridges.

A dynamic balance system without inertial moment
The tonearm itself is perfectly balanced and stylus force is applied only through the tension of the spring. Because of this, there is no moment acting upward due to unevenness of the record surface as with the static balance type. In other words, whatever the condition of the record surface, the stylus force is constant. And there is almost no influence from the warp of record and eccentricity the turntable being out of level, etc.

Type:  Dynamic balance
Effective Length:  237 mm (9-3/8")
Overhang:  15 mm (19/32")
Maximum Tracking Error:  less than 1,5°
Usable Cartridge Weight:  4 - 12 g (0,14 - 0, 42 oz)
Range of Tracking Force Adjustment:  0 - 3 g

Revox A 50

Revox A50 Stereo Amplifier
The A50 amplifier is a unit of central importance within a hifi music system. Its power handling capacity is a decisive factor for high quality sound reproduction from tape, disc or off the air. For this reason, extremely careful attention has been given to every design detail of the Revox A50  Stereo Power Amnplifier, whose sine wave rms rating of 2x40 watts will satisfy the most discriminating demands. Silicon transistors are used throughout its circuitry, which is made up of pluggable PC-boards. From the softest sounds up to the rated output power, distortion remains negligible. pre-set level controls eliminate any volume changes when switching between different signal sources. A separate button provides for off tape monbitoring through the power amplifier. Step-type bass and treble controls permit exactly reproducible settings for each channel, as well as a defined Linear response. headphone outputs and switchable filters round up the many distinctive features of the outstanding revox A50 Stero  Power Amplifier.

Continuous Sine Wave Output:  2 x 40 W at 4-8 Ω  ( 2 x 25 W at 16 Ω )
Music Power:  2 x 70 W at 4-8 Ω  (2 x 40 W at 16 Ω )
Distortion:  less than 0,1% at 1 kHz (less than 0,3% from 40 Hz to 15 kHz)
Intermodulation:  less than 0,3%
Frequency Response:  20 Hz - 20 kHz ±1dB
Powertbandwidth:  10 Hz - 40 kHz
Inputs Sensitivity/Impedance:
Micro :  3 mV/100 k Ω
Phono Magnetic :  3 mV (2 - 7 mV) / 47 k Ω
Tape, Tuner :  100 mV (better than 90 mV)/ 100 k Ω
Auxiliary :  100 mV (better than 90 mV)/ 330 k Ω
Phono Ceramic :  230 mV (better than 180 mV)/ 800 k Ω
Tape Monitor :  250 mV (better than 180 mV)/ 50 k Ω
Signal-to-Noise Ratio (unweighted),
At nominal sensitivity reffered to 40 W, 8 Ω load
Phono :  better than 65 dB
Tape, Tuner, Aux :  better than 75 dB
Tape Monitor :  better than 80 dB
At nominal sensitivity reffered to 50 mW, 8 ohm load
Phono :  better than 50 dB
Tape, Tuner, Aux :  better than 50 dB
Tape Monitor :  better than 50 dB
Intrchannel Crosstalk:  better than 60 dB (1 kHz)
Damping Factor:  better than 20
Tone Control (4 dB steps):  ±12 dB at 60 Hz; ±12 dB at 12 kHz
Low Filter :  -8 dB at 60 Hz (12 dB/oct)
High Filter :  -15 dB at 12 kHz (12 dB/oct)
Loudness Control:  60 Hz : -5 dB/1 kHz: -16 dB / 12 kHz : -12 dB
Phono Equalization (RIAA):  ±1 db / 50 Hz ... 15 kHz
Power Supply:  110,130, 150, 220, 240, 250 V 50/60 Hz
Semiconductor Component:  30 Silicon Transistors;  3 Silicon Rectifiers;  14 Diodes
Dimensions (W x H x D):  415 x 160 x 245 mm
Weight:  8,2 kg (18 lbs)

Revox A 76

A76 Revox Builds the tuner of the future.
The conventional design concepts for tuners are not satisfactory any more if one wants to reach the optimum in freedom from distortion and signal interference. Therefore, Revox have tossed overboard traditional ideas and by designing the "third generation tuner" they have  a whole leap forward.
The approach  has been thoroughly professional and without compromise. The input section features "dual gate" field effect transistors and quadruple variable capacitor tuning, while the IF-strip consists of a passive Gauss Filter, followed by an amplifier which is made up entirely of integrated Circuits (bandwidth 5 MHz). delay-lines are employed for demodulation without deteriorating the five megahertz bandwidth. A76 khz oscillator runs phase-locked to the subcarrier and supplies  after binary scaling the switching frequency to the stereo demodulator. Supplementary circuits permit silent tuning and effect automatic stereo changeover, they triogger a visual signal in th ecase of multipath reception and provide for th eindication of signal strength, centre tuning and the presence of a Stereo modulated carrier. To describe the distortion and noise free performance of  this tuner is virtually impossible.

Special Features:
Antenna Inputs:  60 ohms unbalanced (BNC); 240 ohms balanced (DIN)
RF-Input circuit with 2 MOS-FET and 4-section variable air - capacitor
Passiv gauss IF - Filter
Wideband IF - amplifier with 5 integrated circuits
Delay-line demodulator
Subcarrier regeneration with "phase locked loop" oscillator
Separate subcarrier demodulation with subsequent matrixing
Automatic stereo-mono selection
Silent tuning
Meters for Fieldstrength and Centre tuning indication
Stereo indicator light
Multipath warning light

Tuning Range:  87,5 - 108 MHz
Sensitivity (60 Ω, 30 dB S/N, deviation 15 kHz):  1 µV
Static Selectivity 9at 300 kHz separation):  60 dB
Operational Selectivity (for two signals 100 µV and 1 mV, 40 kHz dev.at 1 kHz, 300 kHz separation):  80 dB
Spurious Response:  90 dB
Image Response:  70 dB
 IF Filter:  130 kHz
IF Ampl. And Demodulator :  5 MHz
Capture ratio:  1 dB
Pulse Noise Rejection (signal 100 µV and 1 mV peak per 100 kHz pulse noise, 75 kHz deviation):  40 dB
Distortion (40 kHz deviation at 1 kHz):  0,2%
Signal-to-Noise Ratio (unweighted, 75 kHz deviation):  70 dB
Stereo Separation:  40 dB 91 kHz)
Pilot Signal and Subcarrier Suppression: 40 dB
Audio Output (75 kHz deviation; adjustable, low internal impedance):  1 V
Frequency Response:  30 Hz - 15 kHz, -1 dB
Deemphasis:  50 µs
Semiconductor Complement:
Dual Insulated-gate FET :  2
Intergated Circuits :  6
Silicon Transistors :  41
Diodes :  27
Silicon Rectifiers :  2
Power Supply:  110, 130, 150, 220, 240, 250 V, 50/60 Hz
Power Consumption:  20 W
Dimensions (W x H x D):  415 x 160 x 245 mm
Weight:  7,8 kg (17,5 lbs)

H.H. Scott PS77XV

Quartz-Lock Direct-Drive Semi-Automatic Turntable
The PS77XV offers absolute speed accuracy by incorporating a quartz synthesizer speed lock system to control a high torque 72 pole FG AC direct-drive motor.
Automatic reject, return, and shut-off functions.
Strobe light and speed controls for flexibility
Unipoint suspension statically-balanced "S" ahaped tone arm for accurate tracking
Quartz lock speed indicator LED
12" finished diecast platter with strobe pattern
Viscous damped are lifter with cueing lever
Low capacitance phono cables
Hinged dust cover

Type:  Direct-drive auto return system with strobe, speed adjust and cueing
Motor:  2-phase, 8-pole coreless quartz DC FG servo motor
Drive System:  Direct drive
speedS:  33-1/3 and 45 rpm
Pitch Control Range:  ±5%
Wow and Flutter:  0,035%
Signal-to-Noise Ratio:  60 dB
Tonearm: 214 mm, static balanced, adjustable weight and anti-skating
Turntable Platter:  12-inch (300 mm), aluminium diecast
Power Requirements:  AC 220V, 50 Hz; AC 120 V, 60 Hz
Power Consumption:  5 watts
Dimensions (W x H x D):  448 x 150 x 354 mm (17-2/3" x 5-3/4" x 13-5/6")
Weight [net/packing]:  8 kg (17,6 lbs)/ 9,5 kg (20,9 lbs)


Hi-Fi U-turn Quick Auto-Reverse Cassette Deck
Hi-fi U-Turn quick auto-reverse system with Flip Reverse Head
Computer-controlled full-logic control
Dolby HX-Pro for wider high-frequency dynamic range
Dolby B.C noise reduction systems
Auto rec Mute to create tapes with smooth song-to-song transitions
Auto tape selector for Normal, CrO₂ and Metal tape
Fluorescent digital counter and peak level meters
Headphone output
Balance control
Tape running indicator

Frequency Response  at -20 VU:
Metal Tape :  20 - 17,000 Hz (30 - 16,000 ±3 dB)
SA/Chrome Tape :  20 -16,000 Hz (30 - 15,000 Hz ±3 dB)
Normal Tape :  20 -16,000 Hz (30 - 15,000 Hz ±3 dB)
Signal-to-Noise  Ratio :  58 dB (metal tape)
Wow and Flutter :  0,08% (WRMS)
Crosstalk (1 kHz):  60 dB
Channel Separation (1 kHz):  40 dB
Harmonic Distortion
Totaal (0 VU, 1 kHz):  1,0% (metal)
K3 (0 VU, 1 kHz) :  0,5% (metal)
Record/Playback:  Metaperm head
Erese :  Two-gap ferrite head
Input Sensitivity/Impedance:  80mV/50 k Ω
Line Out :  300 mV/500 kΩ
Headphones :  0,3 mW/8 Ω (matching impedance 8 - 1 k Ω)
Dimensions (W x H x D):  435 x 115 x 289 mm (17-3/16" x 4-9/16" x 11-7/16")
Weight:  3,8 kg (8,4 lbs)


Full-Logic Control cassette Deck
Computer-controlled full-logic control
Dolby HX-Pro for wider high-frequency dynamic range
Dolby B.C noise reduction systems
Auto rec Mute to create tapes with smooth song-to-song transitions
Auto tape selector for Normal, CrO₂ and Metal tape
LED multi-peak level indicator, one for each channel
Headphone output
Balance control
Tape running indicator

Frequency Response  at -20 VU:
Metal Tape :  20 - 17,000 Hz (30 - 16,000 ±3 dB)
SA/Chrome Tape :  20 -16,000 Hz (30 - 15,000 Hz ±3 dB)
Normal Tape :  20 -16,000 Hz (30 - 15,000 Hz ±3 dB)
Signal-to-Noise  Ratio :  58 dB (metal tape)
Wow and Flutter :  0,08% (WRMS)
Crosstalk (1 kHz):  60 dB
Channel Separation (1 kHz):  40 dB
Harmonic Distortion
Totaal (0 VU, 1 kHz):  1,0% (metal)
K3 (0 VU, 1 kHz) :  0,5% (metal)
Record/Playback:  Metaperm head
Erese :  Two-gap ferrite head
Input Sensitivity/Impedance:  80mV/50 k Ω
Line Out :  300 mV/500 kΩ
Headphones :  0,3 mW/8 Ω (matching impedance 8 - 1 k Ω)
Dimensions (W x H x D):  435 x 115 x 289 mm (17-3/16" x 4-9/16" x 11-7/16")
Weight:  3,7 kg (8,2 lbs)

Teac A-BX10

High-Power Drive Capability
Although the average power output required for normal living-room listening sistuations is only a few watts, musical peaks can demand much higher outputs for brief periods. If the required power is not available, the music loses its dynamic vitality, sounding flat and dull. In this respect many amplifiers perform well when connected to 8 Ω speakers, but faced with 6 Ω or 4 Ω loads - far more common than 8 Ω speakers in the real world - they lose the ability to deliver that all-important musical punch and impact.
Although they have different maximum power outputs, TEAC integrated amplifiers deliver outstanding dynamics power performance. All four models feature "over-designed" power supplies with heavy-duty shielded power transformers - the A-BX10 utilizes a toroidal transformer - and large capacitors, plus parallel-connected output-stage power transistors. They will respond to the demands of the most dynamic music without a trace of strain even when driving low-impedance loads.

Straightforward Circuit Configuration.
In an audio amplifier greater sophistication is not the way to achieve better sound quality. Each and every electronic part has some affect on the sound, and the sum total can mean degraded performance. While it is relatively easy to achieve mediocre. Performance with complex electronics, it is actually much more difficult to design and build the kind of straightforward circuitry needed to deliver pure transparent sound TEAC integrated amplifiers prove that it can be done. Careful design coupled with painstaking parts selection and layout bring you an audible sound-quality advantage.

Fully Balanced Circuit Configuration
Another significant TEAC amplifier design concept is the fully balanced circuit configuration, used in the A-BX10 amplifier. The unbalanced analog signal is instantly converted to a balanced signal in which the signal appears as the difference between two identical amplifier circuits. This is contrary to the unbalanced configuration where one amplifier circuit has the ground plane as its reference. The balanced configuration cancels out power supply noise and hum fieelds. Most importantly however, the ground plane only acts as the DC reference for the output stage and is not included in the signal path.

Inside the A-BX10
Source selection is achieved by electronically controlled relays placed close to the input terminals at the rear panel. The volume potentiometer is placed just behind the relays. This configuration gives an extremely short signal path. Furthermore,, the main PCB is of the double layer type, where the second layer is mainly used to shield the sensitive low level inputs , so called "Ground Plane"

Low NFB Circuit Configuration
It is commonly known that low overall feedback offers better stability and more dynamic sound than high feedback, although the distortion level will be higher. TEAC has chosen to design the amplifier circuits with very low overall feedback and to limit the distortion through a number of local feedback and distortion canceling techniques. The input stage is built using FETs with a voltage gain of only two times and hih common mode rejection. For the large voltage amplifier cell, an enhanced cascode with very low distortion is used. In the output stage, uneven distortion is reduced by lowering the non-feedback output impedance. Finally, the balanced output stage cancels out the even-harmonic distortion. The is an amplifier with both low feedback and low distortion.

Continuous Power Output (RMS): 
100 W + 100 W at 8 ohms (20 - 20,000 Hz)
160 W + 160 W at 4 ohms (20 - 20,000 Hz)
Dynamic Power Output:
120 W + 120 W at 8 ohms
220 W + 220 W at 4 ohms
Total Harmonic Distortion (Continuous rated Output Power):
0,04% at 8 ohms (20 - 20,000 Hz -1 dB)
0,06% at 4 ohms 920 - 20,000 Hz -1 db0
Input Sensitivity/Impedance:
Balanced (XLR) :  1V/20 k Ω
CD, Aux :  300 mV/20 k Ω
Tuner, Tape :  300 mV/20 k Ω
Signal-to-Noise Ratio (IHF-A):  106 dB
Frequency Response:
Balanced (XLR):  20 -40,000 Hz -1 dB
CD, Aux :  20 - 40,000 Hz -1 dB
Tuner, Tape :  20 - 40,000 Hz -1 dB
Dimensions  (W x H x D):  443 x 1-3 x 381 mm
Weight (net):  11,8 kg

Rotel RA-311

 Here is the best example of Rotel's cost-performance outperformer. RA-311 is a new and very versatile stereo pre-main amplifier that let you handle all kinds of program sources. Besides record player, note two tape recorders you can operate and with dubbing, too. And yet another input for an additional component, not counting one for tuner. All can be simply and smoothly controlled by this amplifier's amplr 20W + 20W RMS continuous power both channels driven at wide frequency response and negligible distortion, along with other efficient controls and switches.
 Special Features:
Geared to let you enjoy genuine high fidelity sound
All advanced solid state electronics design
All low-noise silicon output transistors
Handsomely trimmed aluminum extrusion panel
Control layout designed with optimum human engineering
Rotary - Speakers, Bass, Treble, Balance Volume and Function selector
Pushbuttons - High Filter, Loudness, Mode, Tape Monitor 1 and Tape Monitor 2
Convenient headphone jack and power beacon
Facilities for magnetic and ceramic phones, tuner, two tape recorders and auxiliary component
Tape dubbing from tape 1 to tape 2
Speaker 4-channel matrix for simulated 4-channel surround effect
Wood cabinet included
Total Music Power (IHF):  100 W at 4 Ω
Continuous Power (RMS):
30 W + 30 W each channel driven at 4 ohms
24 W + 24 W each channel driven at 8 ohms
25 W + 25 W both channel driven at 4 ohms
20 W + 20 W both channel driven at 8 ohms
(all less than 1% total harmonic distortion at 1 kHz)
Harmonic Distortion:  0,1% at 18W + 18W RMS, 8 Ω
IM Distortion:  0,3% at 18W + 18W RMS, 8 Ω
Frequemcy Response:  15 to 70,000 Hz, -3 dB at 8 Ω
Power Bandwidth (IHF):  20 to 50,000 Hz at 8 Ω
Input Sensitivity/Impedance:
Phono Mag :  2,5 mV/ 40 k Ω
Phono Ceramic :  140 mV/ 94 k Ω
Tuner, Aux :  170 mV/ 46 k Ω
Tape Monitor In 1, 2 :  150 mV/ 46 k Ω
Tape DIN :  330 mV/ 100 k Ω
Signal-to-Noise Ratio: 
Phono:  65 dB
Tuner, Aux :  73 dB
Tape IN :  73 dB
Residual Noise:  1,5 mV
Damping Factor:  50 at 8 Ω
Loudness Control:  +9 dB at 50 Hz; +4 dB at 10 kHz
Bass Control:  ±10 dB at 50 Hz
Treble Control:  ±10 dB at 10 kHz
High Filter:  _9 dB at 50 Hz
Phono Overload:  100 mV
Phono Equalizer:  RIAA ±0,5 dB
Crosstalk"  -45 dB at 10 kHz
Power Voltage:  100, 117, 220, 240 V AC, 50/60 Hz
Dimensions (W x H x D):  14" x 7,5" x 4,5"

Weight:  5,5 kg (12 lbs)

Sansui AU-217

 Clean, Low-Distortion Power
The AU-217 delivers 30 watts per channel min. RMS, both channels driven, into 8 ohms from 20 to 20,000 Hz, with no more than 0,06% total harmonic distortion. 
Circuit configuration in the AU-217 is a differential input with constant current source, followed by a current differential push-pull driver and, finally, a Darlington-arranged power output.  In the driver circuit,  the AU-217, which  is a Sansui exclusive, the advantages include low open-loop distortion and stability against voltage and thermal changes. The Darlington-arranged power output used in both the AU-217 has a low output impedance and features low distortion.

Rated Watts Available on Demand
As mentioned, Sansui uses musical inputs not only steady-state test signals, to test the AU prototypes. Design refinements are made after repeate auditions to ensure musicality. While your own ears can cartainly tell the difference, you might like to know that we have improved the sound by lowering TIM (Transient Intermodulation) distortion, reducing crosstalk and giving the Aus excellent transient response.
As a result, the rated watts on  AU-217  - 30 watts  - are guaranteed to be fully available on demand. What all this means can be understood by the following illustration.
Suppose there's a competitive amp with 30 watts RMS power which has the same specifications as does the AU-217. set the volume controls on at both amps at maximum position, feed both amps with a clipping level signal. A connected oscilloscopewill show clipped waveforms from both amps. Yetwhen a heavily modulated musical signal is applied, the AU-217 still sounds clean and clear, while the rival amp sounds distorted and harsh.  The reasons lie in the fact that the former has far rediced transient intermodulation distortion than the latter.
 Versatile Preamp Section
Precision Phono Equalizer
One of the most critical tasks required of a phono equalizer is precision. If phono signals are "colored" in the equalizer, no tone controls or other devices can ever restore tham to proper "flat" response. This is why we've used only the finest available  parts to give the phono equalizers in the AU-217  the ability to stay within ±0,5 of the RIAA equalization curve over the entire 30 to 15,000 Hz spectrum.
This model use PNO transistor inputs followed by a low-noise NPN transistor direct-coupled amp.fed with dual voltages from the power supply. High overload of 180 mV for the AU-217,  together with accurate RIAA equalization, let you enjoy dynamic unclipped record reproduction even at full power operation.
Bass/Treble NF Controls
The tone control circuit inn the AU-217  is located in the NF (Negative Feedback) network of the elaborate low-distortion power amp. This configuration features low distortion and high signal to noise, because all inputs - Aux, Tuner and Tape  - are sent direct to the power amp, (Phono equalizer output also goes direct to the power amp)
The Bass/Treble controls themselves have click stops for smooth and accurate use. Bass has a range of ±12 dB at 50 Hz Treble is ±11 dB at 15 kHz.

Effective High and Subsonic Filters
Scratchy records, hiss noise from tapes and any other high frequency noise is eliminated effectively without harming musical content since the High Filter on all this new AU models feature a sharp cut-off response of -6 dB/oct with a 3 dB attenuation at 7 kHz. If your phono cartridge has a high "Q" factor or resonance in the low frequencies, or if you want to play warped records without causing subsonic intermodulation, use the Subsonic Filter on the AU-217.

Loudness Switch
The human hearing mechanism becomes insensitive to the high and low ends of the audible spectrum as the level or volume of a sound decreases.  When listening to music at low levels switch in the Loudness circuit on your AU it boosts the lows and highs just enough to restore flat reproduction across the entire frequency range
Rugged Power Supply
Large transformers and electrolytic capacitors form the newly-designed power supplies in both models. The capacitors in the AU-217 are each 6,800 µF. These powerful supplies are located as far as possible from the phono equalizers to avoid hum pickup and assure accurate reproduction of musical input.
Low Profile Design
 The smart new looks of the Sansui AUs are practical too. Each component is designed to fit neatly into a standard EIA equipment rack (such as the Sansui GX-5) along with your Sansui cassette deck, the AX-7 Mixing Amplifier or the matching TU-217 FM/AM Tuner.
Other Features:
Left/Right Balance with Center Clock
Tape Monitor Switch
Stereo Headphone Jack
Large One-Touch Speaker Treminals
AC Outlets - Switched and Unswitched 200 watts each maximum
Power Output
Min. RMS both channels driven 20 - 20,000 Hz, no more than 0,06% T.H.D.:
30 watts per channel into 8 Ω
Min. RMS both channels driven at 1,000 Hz, no more than 0,06% T.H.D.:
37 watts per channel into 4 Ω;
34 watts per channel into 8 Ω
Load Impedance:  8 ohms
Total Harmonic Distortion:  less than 0,06% at or below rated min. RMS poer output
Intermodulation Distortion (70 Hz : 7,000 Hz = 4:1 SmPTE method)
Less than 0,06% at or below rated min. RMS power output
Damping Factor:  80 into 8 Ω
Frequency Response (at 1 watts):
Overall (from AUX):  10 to 50,000 Hz +0,5 dB , -1,5 dB
RIAA  Curve Deviation (30 to 15,000 Hz):  +0,5 dB  -0,5 dB
Input Sensitivity/ Impedance:
Phono :  2,5 mV/ 47 k Ω
Aux :  150 mV/ 47 k Ω
Maximum Input Capability:
Phono :  180 mV RMS
Output Voltage / Impedance:
Tape Rec (PIN):  150 mV into 47 k Ω load/ 300 Ω
Hum and Noise:
Phono :  76 dB
Aux :  94 dB
Channel Separation:
Phono :  65 dB
AUX :  68 dB
Bass :  +12 dB -12 dB at 50 Hz
Treble :  +11 dB -11 dB at 15 kHz
Subsonic :  -3 dB at 13 Hz (6 dB/oct)
High :  -3 dB at 7 kHz  (+6 dB /oct)
Loudness (volume control at -30 dB position):
=8 dB at 50 Hz
+6 dB at 10 kHz
AC Outlets:
Switched :  200 watts max
Unswitched :  200 watts total
Power requirement:
Power Voltage :  100, 120,  220, 240 V;  50/60 Hz
Power Consumption:  145 watts
Semiconductors:  30 transistors; 21 Diodes
Dimensions (W x H x D):  430 z 110 x 340 mm
Weight:  8,4 kg (18,5 ) NET

Rotel RCD 820BX

 Compact Disc Player RCD 820 BX
These high performance CD players offer the latest in CD technology - 16 bit 4 times oversampling system. Featuring twin digital/analogue converters, which simultaneously covert both right and left digital signals, single beam high precision laser tracking and fully programmable music track selection system. All the basic needed to extract very high quality music reproduction from the exciting compact discs now available. The RCD 820BX has all the features of the RCD 820B, plus an additional regulated high quality power supply with an independent transformer to give clean power rails to the D/A converters and an exclusive Rotel's twin two stage analogue filter circuitry. Effectively removing the digital hash from the audio circuits, resulting in a much cleaner audio signal with significant benefits of greater definition, resolution and musical enjoyment.
Frequency Response:  20 -20,000 Hz ±0,08 dB
Dynamic Range:  96 dB
Signal-to-Noise Ratio:  100 dB
Channel Separation:  100 dB
Total Harmonic Distortion:  0,0025% (20-20,000 Hz)
Wow and Flutter:  Quartz crystal precision
D/A Conversion:  Four times oversampling (176,4 kHz) with digital filter and two 16 bit D/A converters
Error Correction System:  Cross interleaved reed solomon code (CIRC)
Audio Output Level:  2 volts RMS
Power Requirements:  120 V, 60 Hz; 220V, 50 Hz, or 240 V , 50 hzz
Dimensions (W x H x D):  440 x 87 x 300 mm
Weight:  5,0 kg

Marantz PM 6006

EISA AWARD Best Product 2016-2017
European Stereo System: 
Marantz PM6006 (and CD6006)
 The PM6006 is an upgraded successor of the multi-award-winning PM6005. We've retained the pre-amp and power-amp sections that exclusively feature discrete components - not a single IC in sight of the signal path. The PM6006 is upgraded for peak current at the amplifier stage, which makes it possible to refine the sound for you in much more detail.
You can connect this superb integrated amplifier directly to a vast range of digital sources and use its superior 24bit/192kHz high current CS4398 DAC to create an unbelievably high level of audio enjoyment with new media. The unit now includes 2 optical and 1 coaxial digital inputs (an additional optical input from the predecessor, PM6005), and the complete digital section is fully shielded by an extra metal housing to ensure that the digital stage has no effect on the analog signal.
All of the original features—such as five-line audio input including phono, two-pairs of gold-plated speaker connections with the convenience of bi-wiring, and a remote handset—are all still there. The lower impedance shielded Toroidal transformer, as well as customized components and unique Marantz HDAM modules care for powerful, dynamic and detailed original Marantz sound. In short, the new PM6006 is a new star with excellent genes.
Power Output (RMS):
45 W at 8 Ω
 60 W at 4 Ω
Frequency Response:  10 Hz - 70 kHz
Total Harmonic Distortion:  0.08 %
Damping Factor        :  100
Signal-to-Noise Ratio:  MM 83 dB
Input Sensitivity        : 
Phono MM :  2.2 mV / 47 k Ω
High Level :  200 mV / 20 k Ω
Signal to Noise Ratio        High Level 102dB (2V input)
Power Consumption:  395 W
Standby Consumption:  0.3 W
Dimensions (W x D x H):  17.3" x 14.6" x 4.1"
Weight:  17.2 lbs

Marantz CD 6006

EISA AWARD Best Product 2016-2017
European Stereo System
MARANTZ CD6006 (and PM6006)

 The CD6006 is a fine-tuned version with even more specially selected components and new layout circuit compared to its CD6005 predecessor. We also added more rigid feet to further eliminate vibration. The oversized power supply feeds the digital and analog circuitry of the player, where the high-quality CS4398 DAC converts digital signals to analog, this is then 'pushed' to the gold-plated synch outputs by Marantz's own small signal amplifier, the HDAM-SA2.
The CD6006 is a match made in heaven for the music lover who wants nothing but the best performance at an attractive price, and it is also perfect for lovers of portable music, thanks to its iPod-digital connectivity. The CD6006 also features a newly developed, complex headphone amplifier with Headphone amp gain setting for a wider range of headphones. In addition, we have included a new remote that also controls the PM6006 amp.
Frequency Response:  2 Hz - 20 kHz
Dynamic Range:  100 dB
Signal-to-Noise Ratio:  110 dB
Total Harmonic Distortion:  0.002%
Channel Separation:  98 dB
D/A Conversion        :  Multi-bit, Delta-Sigma
DAC IC:  CS4398
Digital Filter:  CS4398
Noise Shaper:  CS4398
Low Pass Filter stage:  HDAM
Output Buffer:  HDAM SA2
Headphone amp:  HDAM-SA2+Buffer
Power Consumption:  32 W
Standby Consumption:  0.3 W
Dimensions (W x D x H):  17.3" x 13.5" x 4.1"
Weight: 14.3 lbs

Bowers & Wilkins 802 D3

EISA AWARD Best Product 2016-2017
European High-End Loudspeaker:  
  If you’re looking for stunning realism without the studio-sized footprint, the 802 D3 is the answer. It’s slim proportions make it a comfortable fit for both domestic spaces and recording environments. At home or in the studio, it will reveal depth and detail in music you never knew existed.
The 802 D3 delivers pristine, high-performance sound in any environment. Its Diamond tweeter partners with a Continuum cone to ensure revealing natural sound that will leave you speechless.
Continuum cone
The Continuum cone delivers pristine midrange performance by effectively negating the break-up behaviour that can adversely effect this all-important part of the spectrum.
The innovative plinth provides an incredibly solid base for the 800 Series Diamond. The spikes are ideally positioned below the cabinet, and ingenious engineering allows you to switch between castors and spikes with ease.
Solid body tweeter
The Diamond dome tweeter is housed in a solid piece of aluminium. This mechanically inert structure provides an incredibly rigid platform from which the tweeter can deliver crystal clear sound.
Bracing is essential in keeping a speaker stable, so the character of instruments comes through cleanly. Developed using computer modelling and constructed from wood ply with metal reinforcement, Matrix offers the ultimate in bracing.
Technical Features: 
Diamond tweeter
Continuum cone FST™
Anti-Resonance plug
Turbine head
Aerofoil cone bass units
Optimised matrix
Solid body tweeter
System Description:  3-way vented-box system
Drive units: 
1x ø25mm (1") diamond dome high-frequency
1x ø150mm (6") Continuum cone FST™ midrange
2x ø200mm (8") Aerofoil cone bass units
Frequency Range:  14 Hz to 35 kHz
Frequency Response:  17 Hz to 28 kHz (±3 dB from reference axis)
Sensitivity:  90 dB (on axis at 2.83Vrms)
Harmonic Distortion:  2nd and 3rd harmonics (90 dB, 1m on axis)
Less than 1 % 80Hz - 20kHz
Less than 0.3% 100Hz - 20kHz
Nominal Impedance:  8Ω (minimum 3 Ω)
Recommended Amplifier Power:  50 W - 500 W into 8Ω on unclipped programme
Max. Recommended Cable Impedance:   0.1 Ω
Dimensions (H xW x D):  1212 x 390 x 583 mm (47.7" x 15.4" x 23")
Net weight:  94,5 kg (208 lb)
Finishes Cabinet:   Real wood veneers,  Rosenut  , Painted finish, Gloss Black, Satin White    
Grille:  Black or Grey

Elac Debut F6

EISA AWARD Best Product 2016-2017
European Loudspeaker
 The Debut F6 loudspeaker combines the advanced drivers of the B6 bookshelf in a floorstanding 3-way, bass-reflex design that takes Debut performance to the limit. With sound that rivals speakers costing many times more, the F6 shows that quality components and superior engineering are a winning combination every time. Combine a pair of F6 with a Debut powered subwoofer for a truly stunning two-channel audio system.
Custom-Designed Drivers with Aramid-Fiber Cones
Aramid fiber is employed in the woofers of all ELAC Debut passive speaker systems. Aramid fiber offers a superior strength-to-weight ratio and improved damping characteristics over conventional paper or plastic drivers. This added strength means arriving at designs that achieve a broader bandwidth with smoother response.
Silk-Dome Tweeter with Deep-Spheroid Custom Waveguide
The waveguide surrounding the new ELAC high-frequency driver features a custom, deep spheroid profile to improve directivity control and shield the dome tweeter from cabinet diffraction modes inherent in traditional box enclosures.
Intricate Cossover
A custom multi-element crossover with high-grade components in each speaker ensures smooth transition between the drivers.
Robust Cabinets
Every ELAC enclosure is engineered for the long run with thick MDF outer walls and a luxurious textured vinyl finish. The cabinet of the F6 incorporates specially designed internal bracing to add stiffness and strength to the cabinet’s outer walls. This bracing greatly reduces cabinet vibration, which causes unwanted coloration to the sound. ELAC believes that the only parts of a speaker that should be moving are the speaker drivers themselves.
Superior Build Quality
Count the parts and look at them closely. These don’t look like the components that go in such competitively priced speakers, but rather, speakers that cost much more.
Speaker Type:  3-way, bass reflex
Tweeter:  1 x 1" cloth dome
Midrange:  1 x 6.5" woven aramid-fiber cone
Woofer:  2 x 6.5" woven aramid-fiber cone
Crossover Frequency:  100 / 3,000 Hz
Frequency Response:  39 Hz to 20,000 Hz
Sensitivity:  87 dB at 2.83 v/1m
Recommended Amplifier Power:  30 to 150 wpc
Nominal/Peak Power Handling:  80 / 150 wpc
Nominal Impedance:  6  Ω; minimum 5.4 Ω
Binding Posts:  5-way metal
Magnetic Shielding:  No
Cabinet Finishes:  Black brushed vinyl
Accessories Included:  Removable fabric grille
Dimensions (H x W x D):  1092 x 216 x 254 mm (43" x 8,5" x 10")
Net weight (each):   21.2 kg (46.7 lb)