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

Pioneer T-600 reel to reel


Pioneer model T-600 is totally new kind of stereoo tape deck.

Easy loading, split second reversing. Pioneer's T-600 is a stereo tape deck of exceptionally high quality with special features and a host of major and minor innovations. This includes the world's fastest auto reverse -0,5 seconds, one hand Pioneer Loading - easy and quick, unique center capstan drive, and the most advanced solid state circuitry on the market.


Full facilities for 4-track stereo recording/playback

Quick easy loading

Versatile tape reversal

Staigth-line function lever

Center capstan drive

Automatic braking

Hysteresis synchronous motor

Advanced solid state circuitry for reliable high performance

Four-digit counter with instant push-button resetting

Headphone jack for direct monitoring at any time

Dramatic and dynamic design of true distinction

Special stand to facilitate either horizontal or vertical operation


Many expensive recorders offer automatic reverse playback, a few offer automatic reverse recording. But only Pioneer offers automatic reverse playback and recording that operate in less than 0,5 seconds. This unbelievable technological achievement is a significant advance in stereophonic recording. In effect, it means that you have twice the length of tape available when recording. Only now can you be sure of capturing the longest symphony or opera or jazz festival without an ugly, irritating break. This reverse system operates automatically. Or manually - simply push a button and instantly you recent in the reverse direction. With Pioneer's instant reverse working for you, you need never miss a recording opportunity again.

This automatic system uses sensing foil, and is automatically cut out when the function lever is on Fast. Thus it is absolutely impossible for tape damage to occur from the reversal system.



Tape Drive System:  Center capstan drive with auto reverse recording and playback by means of sensing foil, and manual revers and playback by means of reverse switch.

Track System:

4-track, 2-channel stereo recording an playback

4-track, 1-channel monaural recording and playback

Rec & Playback:  NAB standards

Erasing System:  AC erasing

Reel Size:  up to 7 inches

Motor:  Hysteresis synchronous motor


Two x 4-track, 2-channel Rec/Pb head

Two x 4-track 2-channel Erasing head

Tape Speeds:  7-1/2 and 3-13/4 inches /sec

Rewinding Time:  approx. 110 sec for standard 7-inch reel

Wow and Flutter:  less than 0,12% at 7-1/2 inches/sec,

Less than 0,20% at 3-3/4 inches/sec

Frequency Response: 

30 to 20,000 Hz (50 to 15,000 Hz ±3 dB) at 7-1/2 inch/sec.

30 to 20,000 Hz at 3-3/4 inch/sec.

Signal-to-Noise Ratio:  50 dB

Input Level:

Microphone :  0,45 mv/ 50 k

Line :  45 mv/360 k  

Output Level:

Line Output Fixed :  0,775 mv/ 50 k

Line Output Controlled :  more than 1 V/ 100 k  

Headphones :  more than 0,45 mV/ 8  

Rec/Pb Connector:  DIN standard

Built-in Pre-amplifier:  18 transistors, 8 Diodes

Power Requirements:  110, 117, 130, 220 and 240 V AC,  50/60 Hz

Power Consumption:  70 watts

Dimensions (W x H x D):  435 x 200 x 422 mm (17-1/4" x 8" x 17-1/8")

Weight:  15 kg (33 lbs)

Toshiba HR-10M headphones

Dynamic type headphones

Frequency Response:  20 - 20,0000 Hz

Sensitivity:  97 dB 1W/1m

Weight:  50 g (1,8 oz) 

Adcom GFA-565 power amp

Adcom stereo components have a loyal and devoted following, having earned a reputation among audiophiles, engineers and musicians for extraordinary performance at affordable prices. Now Adcom introduces its newest amplifier, the no compromise GFA-565, for those in pursuit of absolute power and sonic perfection, but who prefer not paying a king;s ransom.

The evolution od Adcom's GFA-565

Adcom's new mono GFA-565 evolves from the design of the critically acclaimed GFA-555, greatly extending its capabilities. Representing brute strength, it delivers 300 watts at 8 ohms, 450 watts at 4 ohms and an awesome 850 watts at 2 ohms. most significantly, it will accurately drive even esoteric loudspeakers which present loads as low as 1 ohm.

Inspired by the GFA-555, the new GFA-565's well-regulated, high-current power supply has an enormous reserve capacity to meet tremendous dynamic demands, resulting in distortion free reproduction on a continuous basis.

Why use Two Mono Amplifiers?

The ability to deliver very high power into complex loads is a prereguisite for superior sound reproduction. power supplies capable of delivering the energy necessary for high power, high-current amplifiers are massive. but there are prectical limits to the size and weight of stereo amplifiers designed for home use, as well as heat dissipation and reliability constraints. consequently, the use of two Adcom GFA-565 mono amplifiers offers optimum sound definition, detail and dynamics, satisfying even the most demanding perfectionist.

More Sound. Less Money

Like the GFA-555, the new Adcom GFA-565 sound superior to amplifiers costing two and three times as much. it is so powerful and pure that it may be the last amplifier you ever buy, even if you upgrade your loudspeakers several times over the years. And that makes the GFA-565 an extraordinary bargain considering its exceptional performance.


High-Current Output Stage

More and more of today's high performance loudspeakers exhibit very low impedances and particularly difficult loads. many so-called esoteric amplifiers are incapable of delivering large amounts of undistorted power continuously into these complex loads thereby defeating the objectives of the loudspeaker's design. The GFA-565's highly advanced, triple darlington output stage featuring 20 rugged, discrete output transitors is designed to deliver extremely high-current at low impedances and reactive loads. No protection circuitry or current limiting devices are incorporated which would restrict the delivery of full power output. Protection against short term overloads, short circuits or long term, excessive output is achieved by non-interfering power supply fuses and thermal circuit breakers.


Well regulated, High-Current Power Supply

Advancements in CD technology and the introduction of digital audio tape have created opprtunities to reproduce the full dynamics and psychoacoustic experience of a live musical performance. To realize the full potential of this technology, amplifiers and loudspeakers must be capable of delivering tremendous energy continuously, not just for tiny fractions of a second. The massive power supply of GFA-565, featuring 70,000 microfarads of filter capacitance and a huge 1,25 kVA toroidal power transformer, has enormous reserve power capability. this is a no compromise power supply that eliminates all audible limitations. Hum, vibration and noise, the byproducts of lasser power supplies, have also been reduced to an absolute minimum. For most home applications, the optional variable speed cooling fan is unnecessary, making the GFA-565 a silent performer despite its formidable power.

Instananeous Distortion Alert

A highly accurate LED on the front panel is activated by a unique monitor circuit if any form of distortion - THD, IM, TIM, SID, etc. - exceeds 1 percent. this will provide ample warning that the music system is being operated beyond its design parameters.


Continuous Power Output (20 Hz - 20 kHz, less than 0,02% THD)

300 watts/channel at 8 Ω

450 watts/channel at 4 Ω

850 watts/channel at 2 Ω

Signal-to-Noise  Ratio:  better than 106 dB (A-weighted, full output)

Input Impedance:  50 - 700 Ω

Input Sensitivity:

For Rated Output :  2,15 V

For 1 Watt :  130 mV

Damping Factor:  better than 1000 at 8 Ω  (20 Hz - 20 kHz)

Dynamic Headroom (at 4 Ω):  1,6 dB

Voltage:  120 V, 60 Hz (availaable in 220 V, 50 Hz on special order)

Dimensions (W x H x D) :  432 x 210 x 292 mm (17" x 8-1/4" x 11-1/2")

Weight (shipping):  20,5 kg (45 lbs)


Top mounted, automatically variable, ventilating fan (565 FAN)

Rear mounted, symmetrical balanced line input circuit (565 BAL)

Rack mount adaptors (RM-8)

White front panel and switch

Meridian 588 CD player

Meridian is the leader in high-end CD playback. 
Since we revolutionised the performance expectations of CD with the MCD-pro in 1984 we have steadily advanced the art of digital audio.Our reputation in the field is further confirmed by the choice of MLP (Meridian Lossless Packing) as the mandated standard for DVD-Audio.
The New Meridian 588, evolved from our famous 508 and award winning 800 CD machineuses a ROM drive for precise recovery of detail. As a result, error correction is ten times more effective. Triple buffer stages provide astonishingly low jitter. The 588 has the highest quality 2-channel output using 192kH224-bit DACs and full RS232 control and status with software upgradeability. The 588 will also play CD-R discs with MP3 data.

Meridian 588
588 uses a precision DVD-ROM drive to read information from the discs using a technology developed for the Meridian 800 Series. This drive’s precise pickup system is optimised for CD and CDR playback.
The data from the disc is checked, corrected and decoded using an extremely powerful digital processing system. Within the data path are three large memory buffers – each one in turn establishing smoother data flow so that the final audio has the lowest possible jitter.
These steps all ensure that you can enjoy the highest quality audio from your discs. Advanced digital and analogue design and construction techniques combine to provide the highest performance. 588 is built using 6-layer PCBs, 7 separate power supplies, the latest surface-mount technology and components which have been carefully selected to optimize und quality.
The 588 operating software has been developed by Meridian and benefits from our vast expertise on CD navigation, playability and sound quality. 
In addition to CD the 588 can replay MP3 discs giving the best access to playback longplaying audio collections on a main system. MP3 discs can include personal albums (MP3 files optionally grouped as albums by directory) on a Recordable CD (CD-R).
An RS232 port supports full control of the player and provides for future software updates.

Sound Quality
588 maximizes sound quality by reducing jitter to very low levels. Unlike other players that try to lower jitter by controlling drive vibration, the 588’s triple buffer memory architecture abolishes this problem forever. In 588 the audio is controlled using a precise master oscillator located within the final output section. The result of this sophisticated effort is a clear, open, authoritative sound. The digital output is precision re-clocked.
The stereo analogue output uses 192kHz 24-bit advanced DACs combined with a superb direct-coupled audiophile-standard output amplifier.

Formats:  CD Audio (CD-DA), CD-R, MP3.
Total Harmonic Distortion:  less than -93 dB
Noise:  less than -93 dB
Mechanism:  Dual-lens pickup with red laser
Processing:  DSP software provides error correction and on-board decoding for MPEG Audio
Conversion:  24-bit Delta Sigma
Audio Outputs:
1 x  Coax. Digital SPDIF/IEC1937.
1 x Optical Toslink to EIAJ IEC and data compatible
1 x pair balanced outputs XLR sockets
1 x Analogue stereo direct-coupled design featuring 192 kHz. 24-bit conversion.
All audio outputs use FIFO and relocking to give extremely low jitter
Superb direct-coupled analogue design featuring 192kHz 24-bit conversion.
All audio outputs have extremely low jitter due to innovative FIFO and re-clocking scheme.
Front-panel controls for Open/Close, Play, Stop, Pause, Previous, Next and Off.
Full RS232 control and status for custom integration or automation.
A Meridian System Remote is included.
Front Display: 12 character display. Indicators for CD, MP3 and Repeat.
Power Supply:  100 – 240 V, 50/60 Hz,
Power Consumption:  25 W.
Dimension (W x H x D):  321 x 88 x 332 mm (12.64" x 3.46" x 13.07")
Weight: 6,4 kg (14 lbs) 

Koss CM-1030 loudspeakers



The Koss CM/1030 represents the culmination of theory, technology and engineering experience in loudspeaker design. First, Koss engineers set the parameters for frequency response, efficiency and cabinet size. From these initial specifications, the Koss Theory developed specific design characteristics that include a 10-inch woofer, a mass aligned dual port system,, a parallel midrange system, and both a tweeter and treble tweeter that feature a unique acoustic transformer. And to mesh the system into an unbelievably beautiful entity, the CM/1030 uses a quasi second-orede crossover network. Once you've heard the Koss CM/1030 , we think you'll agree that no 4 bandpass system available today even comes close in performance.


Although much has been attributed to the speed and efficiency of the modern computer, there is little that any computer can accomplish without first having the specific scientific equations and data necessary to achieve specified goals. In the case of the new Koss CM loudspeaker systems, the modern computer allowed Koss engineers to perform the massive and complex audio engineering calculations required in using network synthesis to establish the engineering parameters for all CM systems.

Nevertheless, whereas the computer may have simplified the workload, it was still the genius of electrical and audio engineers and even, in the case of the cabinet designs, the brilliance of structural engineers, that made this remarkable new generation of loudspeaker systems possible.



Bandpass Response (to typify the normal listening room situation):

Low Frequency ;  3 dB down point 29 Hz

High Frequency :  3 dB down point 19 kHz

Overall System Response :  6 dB down point 26 Hz to 19,5 kHz

Polar Response:  -3 dB (at 8 kHz);  -6 dB (at 10 kHz)

Intermodulation Distortion Products:  less than 0,1%

Reference Sensitivity:  94 dB SPL

Recommended Amplified Power Rating (8 ohm):  15 watts/channel (minimum); 200 watts/channel (maximum)

Impedance:  5 Ω (nominal), 4 Ω (minimum)

Input Power Overload Protection:  Fused 3 AG 3 A

Dimensions (W x D x H):  16-1/2" x 14-1/2" x 38-7/8"

Weight:  74 lbs

Zenith MC-7050 receiver

Zenith's top-of-the-line stereo receiver, model MC7050, is a tuner/amplifier unit offering 40 watts of RMS power per channel minimum into 8 ohms, over a bandwidth of 20 to 20,000 Hz. The Total Harmonic Distortion is put at 0,2percent or less. A loudness compensation switch automatically increases low and high frequencies for richer sound at low volume levels, while high and low filters eliminate frequency noise at both ends of the sound spectrum. The tuner section  has tuned RF on FM, a ceramic filter to eliminate noise and alternate stations interference, a MOS FET integrated circuit to "Lock In" FM stations and a phase-locked loop MPX integrated circuit to maintain precise phasing of pilot and subcarrier signals on FM for low distortion and good stereo separation. Other features include; tape monitor; tape dubbing; 41-position detent volume control; 11-position detent bass and treble controls; center detent balance control; A/B/A+B speaker selector; FM mute; headphone and microphone jacks; flywheel tuning ; separate tuning and signal strength meters.
Power Amp Section
Continuous Power Output:  40 watts pef channel (min. RMS at 8 Ω, from 20 -20,000 Hz, no more than 0,2% Total Harmonic Distortion)
Total Harmonic Distortion (20 Hz to 20 kHz from Aux)
Continuous Rated Power Output :  no more than 0,2%
1 watt per Channel Output
8 Ω :  no more than 0,08%
Intermodulation Distortion (50 Hz : 7,000 Hz = 4: 1, from Aux)
Continuous Rated Power Output:  no more than 0,2%
1 watt per Channel Power Output
8 Ω :  0,05%
Damping Factor (20 Hz - 20 kHz, 8 Ω):  40
Input Sensitivity/Impedance:
Phono 1, 2 :  2,5 mV/50 k Ω
Mic :  2,5 mV/50 k Ω
Aux :  150 mV/50 k Ω
Tape Play :  150 mV/50 k Ω
Phono Overload Level (T.H.D. 0,1%)
Phono :  125 mV 91 kHz)
Output Level/Impedance
Tape Rec :  150 mV
Headphone : low impedance
Frequency Response:
Phono (RIAA equalization) :  30 Hz - 15,000 Hz ±1 dB
Aux, Tape Play :  20 Hz - 20,000 Hz ±1 dB
Tone Controls
Bass :  ±10 dB at 100 Hz
Treble :  ±10 dB at 10 kHz
High :  -9 dB at 10 kHz
Low :  -6 dB at 100 Hz
Loudness Contour (Vol. Control set at approx. 40 dB position) :  +10 dB at 100 Hz; +5 dB at 10 kHz
Hum and Noise (IHF, short-circuited, A network, Rated Power):
Phono :  75 dB
Aux, Tape Play :  85 dB
FM Section
Usable Sensitivity
Mono : 10,3 dBf (1,8 µV)
Stereo :  19,0 dBf (4,9 µV)
50 dB Quieting Sensitivity
Mono :  14,8 dBf (3,0 µV)
Stereo :  37,3 dBf (40 µV)
Signal-to-Noise Ratio
Mono :  70 dB
Stereo :  65 dB
Distortion at 65 dBf 100 Hz 1 kHz
Mono :  0,1%
Stereo :  0,3%
Frequency Response:  30 Hz - 15 kh ( +0,6 dB -2,0 dB)
Capture Ratio:  1,0 dB
Alternate Channel Selectivity:  70 dB
Spurious Response Ratio:  75 dB
Image response Ratio:  65 dB
IF response ratio:  90 dB
AM Suppression Ratio:  60 dB
Muting Threshold:  19,2 dBf (5,0 µV)
Stereo Separation
At 1 kHz :  45 dB
IHF :  35 dB
Subcarrier product ratio:  60 dB
SCA Rejection Ratio:  65 dB
Antenna Input:  300 Ω (balanced), 75 Ω (unbalanced)
AM Section
IHF Ferrite Antenna :  200 µV/m
IHF External Antenna :  15 µV
Selectivity:  40 dB
Signal-to-Noise Ratio :  50 dB
Image Response Ratio:  45 dB
IF Response Ratio:  40 dB
Antenna:  Built-in Ferrite loopstick Antenna
Semiconductors:  45 transitors; 27 Diodes; 5 ICs; 1 FET
General section
Power Requirements:  120 V 60 Hz
Power Consumption:  280watts
Dimensions (W x H x D):  19,27" x 14,96" x 5,51"
Weight:  27,5 lbs

Monitor Audio R700MD loudspeakers

The R700MD is a classic case of producing a big, dynamic sound from a small enclosure. It utilizes Monitor Audio's unique metal-dome tweeter technology with an advanced polypropylene bass driver. These two drivers have been specially designed to naturally compliment each other, thus minimum cross over elements are required, ensuring maximum efficiency and minimum distortion. The cabinet also incorporates a port at the rear to reinforce the bass response. The cabinet is internally braced and damped with both bituminous pads and acoustic foam with the front baffle made of medite. The result is a very rigid, dead anclosure. The crossover elements are hardwired and hotglued to their housing to further reduce the effects of vibration.
The size and finish of the R700MD elegantly understates the impressive sound that it is capable of achieving. Cabinet construction and woofer design ensure good bass response whilst the unique tweeter produces a sweetness of high-end detail.

System Type:  2-way, stands designed,  Reflex
Frequency Range:  40 Hz - 20 kHz
Frequency Response:  55 Hz - 20 kHz ±3 dB
Impedance:  8 Ω
Sensitivity:  89 dB
Recommended AAMp. Power:  20 - 100 watts
Dimensions (H x W x D):  350 x 216 x 252 mm
Weight:  6,6 kg
Finish:  Walnut, Oak, Black

Mordaunt-Short MS300 loudspeakers

Unparallelled musical involvement
Like the MS100, the MS300 also employs "pseudo-active" drive but, by using a secondary bass unit and a larger cabinet, it achieves a significant increase in dynamic range and bass extension - adding authority too the vitality of its musical performance. The highly informative character of both the MS100 and MS300 demands use with top quality drive equipment, careful setting up and, preferably, frame stand mounting.

POSITEC Total Overload Protection System
POSITEC is an entirely new, automatic, low cost, protection system, pioneered and optimised by Mordaunt-Short and now fitted to all MS loudspeakers, safeguarding them against accidental overload and equipment malfunctions, in use with amplifiers rated up to 300 watts per channel.
Inaudible during normal use, POSITEC shuts down any drive unit at risk from overload - resetting automatically afterwards.

Drive Units:
Low Frequency :  2 x 165 mm cone (MSB165B) Bass
High Frequency :  1 x 12 mm synthetic dome tweeter
Sensitivity:  89 dB at 1W/1m
Max. SPL :  112,5 dB peak
Amp. Recommand:  25-300 watts per channel
Dimensions (H x W x D):  540 x 225 x 245 mm
Finishes:  light Oak or Walnut selected Wood Veneer

Technics SU-8044K amplifier

Technics presents an amp which, while not the absolute highest in power, has plenty of punch especislly for the majority of people who listen to music at less than full power from their amps anyway. And we haven't neglected waveform fidelity, which means that this amp will amplify the input signal while adding or subtracting little or nothing from the waveforms of the original music. So you'll get distortion-free amplificationover a wide and flat frequency range. Plus these great operating conveniences; FL meters to replace conventional output meters, a versatile recording selector, a stable, rugged power supply and advanced NF-type tone controls. The list of features and specs will give you the facts and figures. But the real test of this amp is in the listening.

DC Power Amplifier Helps Preserve Waveform  Fidelity
Waveformfidelity has been greatly enhanced in Technics SU-8044K by the elimination of coupling capacitors not only in the signal path but also in the NFB loop.
The lack of something is offen a defect. But here the absence of capacitors means gain all the way down to 0hz and phase linearity in the bass frequencies. The result, in this DC power amplifier, is waveform fidelity - the accurate reproduction of musical waveforms.

Advanced Power Dynamic Sound
The SU-8044K offers plenty of power for dynamic sound, and superior waveform fidelity. Here are some of the circuit features that make it possible; a single-packaged, low-noise dual transistor is used in the differential amplifier first stage for low noise and precise thermal tracking. Current-mirror loading provides high open loop gain, without increasing the level of noise. This output assisted by the emiter follower, drives the voltage amplifiaction stage (Class A) with minimal distortion especially in the high frequency range. A 2-stage Darlington connection is used in the power stage, all adding up to plenty of power and insignificant distortion.

Super Quiet Phono Equalizer
The SU-8044K has an unbelievably high Signal-to-Noise ratio of 80 dB (at 2,5 mV sens. IHF A) when using an MM type cartridge, a spec rarely found in this amp's price class. It means that noise won't interfere with your enjoyment of records, evn during very soft passages. There is a 3-stage direct coupling MM phono equalizer section with direct coupling of the PNP-NPN transistors, plus a PNP transistor in the emitter-follower. A few of the reasons for low distortion and high gain are the separation of DC and AC in the negative feedback loop of the equalizer, 100% DC feedback and the use of narrow tolerance components for negative feedback.

Treble and bass Controls
An advanced operational IC is used for the negative feedback-type tone controls. Bass and treble can be easily boosted or attenuated to suit individual tastes without introducing distortion.

Accurate peak-Power Indication
The easy-to-read FL (fluorescent) meters are an improvement over conventional peak power indicators because of their near-instantaneous response and superior accuracy. They can be switched between two ranges: 0,1W - 100W, a range that is useful when metering for full peak power: 0,01 W - 10 W, the range at which most listening is usually done.

Versatile  Recording Selector
The SU-8044K has two tape positions on the input selector as well as on the recording selector in a logical and practical layout. With this complete separation, you can do such things as dub from tape to tape while listening to your favorite disc. Or tape from your tuner while listening to music on another tape.

Rugged Stable power Supply
The power supply is designed to handle the sudden current demands of high energy musical transients without losing sound clarity or introducing transient crosstalk. This is done by using two large capacity 8,200 µF electrolytic capacitors in the bridged, full-wave rectifier circuit and by employing a recently-developed transformer. It also supplies regulated voltage to the phono equalizer circuit. The transformer coils are floated in a special resin to absorb unwanted vibrations. Even at low volume levels you can enjoy your favorite music without being bothered by a noisy transformer.

Other Features
Muting circuit eliminates shock noise when the power is turned on and off, providing added speaker protection.
High filter to cut out high frequency noise such as record scratches and tape hiss.
Loudness switch for use when lisstening at low volume levels. Lows and highs are boosted to make up for "deficiencies" in the way the human ear responds at low volume levels.
Front-panel speaker selector lets you select either of two speaker systems (A or B) boith or at onec (A + B)

Amplifier Section (IHF)
Continuous Power both Channel Driven
From 20 Hz - 20 kHz
2 x 40 W  at 4 Ω
2 x 38 W at 8 Ω
From 40 Hz - 16 kHz
2 x 40 W at 4 Ω
2 x 38 W at 8 Ω
At 1 kHz
2 x 46 W at 4 Ω
2 x 40 W at 8 Ω
Total Harmonic Distortion:
Rated Power (20 Hz to 20 kHz)
0,03% at 4 Ω
0,02% at 8 Ω
Rated Power (40 Hz - 16 kHz)
0,03% at 4 Ω
0,02% at 8 Ω
Rated Power (1 kHz)
0,03% at 4 Ω
 0,02% at 8 Ω
Half Power (1 kHz) :   0,015% (8 Ω)
Half Power (20 Hz - 20 kHz) :  0,08% (8 Ω)
-26 dB Power (1 kHz) :  0,15% (4 Ω)
50 mW Power (1 kHz) :  0,2% (4 Ω)
Intermodulation Distortion:
Rated Power (250 Hz : 8 kHz = 4 : 1 ) :  0,03%
Rated Power (60 Hz  : 7 kHz = 4 : 1 SMPTE 8 Ω) :  0,02%
Power Bandwidth( both channel driven -3 dB): 
At 4 Ω :  5 Hz - 30 kHz
At 8 Ω :  5 Hz - 50 kHz
Residual Hum and Noise:  0,8 mV (0,6 mV, IHF  A)
Damping Factor:  16 (4 Ω);  32 (8 Ω)
Headphones Output Level/Impedance:  400 mV/330 Ω
Load Impedance
Main or Remote:  4 Ω - 16 Ω
Main and Remote:  8 Ω - 16 Ω
Input Sensitivity/Impedance
Phono :  2,5 mV/47 k Ω
Tuner, Aux :  150 mV/47 k Ω
Tape 1, Rec/Play :  180 mV/33 k Ω
Tape 2 :  150 mV/33 k Ω
Phono Max.input Voltage (1 kHz RMS):  150 mV
Signal-to-Noise Ratio
Rated Power (4 Ω)
Phono :  73 dB (80 dB IHF A)
Tuner, Aux, Tape :  86 dB (97 dB, IHF A)
-26 dB Power (4 Ω)
Phono :  62 dB
Tuner, Aux, Tape :  63 dB
50 mW Power (4 Ω)
Phono :  58 dB
Tuner. Aux, tape :  60 dB
Frequency Response;
Phono :  30 Hz - 15 kHz (RIAA standard curve ±0,8 dB)
Tuner, Aux, Tape :  10 Hz - 50 kHz (-1 dB) ±0,5 dB (20 Hz - 20 kHz)
Tone Controls
Bass :  50 Hz +10 dB /-10 dB
Treble ;  20 kHz +10 dB / -10 dB
High Filter:  7 kHz, -6 dB/oct
Loudness Control (Volume at -30 dB):  50 Hz , +9 dB
Output Voltage/Impedance
Rec Out :  150 mV
Rec /Play :  30 mV/82 k Ω
Channel Balance
Aux (250 Hz - 6300 Hz) ±1 dB
Channel Separation
Aux (1 kHz) 58 dB
Power Consumption: 400 W
Power Supply:  AC 110/120/220/240 V 50/60 Hz
Dimensions (W x H x D):  430 x 142 x 255 mm 916-15/16" x 5-19/32" x 10-1/32")
Weight:  6,7 kg (14,8 lb)

JMlab Chorus 725 loudspeakers

Type:  3-way bass reflex floor standing loudspeaker
LF :  two 6-1/2" Polyglass cone woofers with 1" coil
MF :  6-1/2" Polyglass mid-bass with 1" coil
HF :  1" Treated Titanium inverted dome tweeter with 3/4" coil
Low Frequency (-6 dB)point):  37 Hz
Frequency Response:  47 Hz - 22,000 Hz ±3 dB
Efficiency (2,8 V/1 m):  92 dB
Nominal Impedance:  8 Ω
Minimum Impedance:  4,1 Ω
Crossover Frequencies:  400 Hz, 2400 Hz
Maximal Power Handling with Musical program:  150 W
Recommended Amplifier:  25 - 125 W
Dimensions (H x W x D):  980 x 200 x 300 mm
Net Weight:  17,4 kg
Cabinet Finish:  Black Ash, Cherry, Calvadob
Front Cover:  Black acoustically transparent cloth
Port:  one front circular port
Positioning / Accesories:  Floor standing / Four rubber feet and four spikes included
Rear Connectors:  Two pair of gold plated binding posts

JMlab Chorus 715 loudspeakers

Type:  2,5-way bass reflex floor standing loudspeaker
LF :  Two 6-1/2" Polyglass mid-bass with 1" coil
HF :  1" Treated Titanium inverted dome tweeter with 3/4" coil
Low Frequency (-6 dB)point):  40 Hz
Frequency Response:  49 Hz - 22,000 Hz ±3 dB
Efficiency (2,8 V/1 m):  91,5 dB
Nominal Impedance:  8 Ω
Minimum Impedance:  3,4 Ω
Crossover Frequencies:  350 Hz, 2400 Hz
Maximal Power Handling with Musical program:  125 W
Recommended Amplifier:  25 - 100 W
Dimensions (H x W x D):  930 x 200 x 270 mm
Net Weight:  14,3 kg
Cabinet Finish:  Black Ash, Cherry, Calvadob
Front Cover:  Black acoustically transparent cloth
Port:  one front circular port
Positioning / Accesories:  Floor standing / Four rubber feet and four spikes included
Rear Connectors:  Two pair of gold plated binding posts

JMlab Chorus 710 loudspeakers

Type:  2-way bass reflex floor standing loudspeaker
LLF : 6-1/2" Polyglass mid-bass with 1" coil
HF :  1" Treated Titanium inverted dome tweeter with 3/4" coil
Low Frequency (-6 dB)point):  45 Hz
Frequency Response:  51 Hz - 22,000 Hz ±3 dB
Efficiency (2,8 V/1 m):  89,5 dB
Nominal Impedance:  8 Ω
Minimum Impedance:  3,9 Ω
Crossover Frequencies:  2400 Hz
Maximal Power Handling with Musical program:  80 W
Recommended Amplifier:  20 - 60 W
Dimensions (H x W x D):  855 x 200 x 270 mm
Net Weight:  12,5 kg
Cabinet Finish:  Black Ash, Cherry, Calvadob
Front Cover:  Black acoustically transparent cloth
Port:  one front circular port
Positioning / Accesories:  Floor standing / Four rubber feet and four spikes included
Rear Connectors:  single pair of gold plated binding posts