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

NAD 5220 CD player

NAD's Compact Disc players are known for fine sound, superior tracking, powerful error correction, and reliable construction. But the greatest differecnce between NAD players and other is NAD's uniquely simple and logical approach to design.
The NAD 5220  CD player is securely in this no-frills, high-performance, best buy tradition. They were created for people whose primary interesst is music, not gadgets. The theme of simplicity extends to their analog output circuits as well; with only a handful of electronic components in the signal path, their sound is particularly pure and clean.
This player is eqquipped withh full-disc automatic repeat and programmable memory playback of up to sixteen selections in any order. And both players include new features of significant value to users. The economical NAD 5220 adds a Timer Pay feature that autimatically plays a disc when the power is switched on. So, by plugging the player's AC power cord  into a clock timer, you can provide your own choice of wake up music in the morning instead of depending on a clock radio.
NAD 5220 employ a solid metal chassis for maximum stability, precise alignment, and long-term reliability. The metal chassis provides electrical shielding to reduce leakage of interference from the digital circuits into your phono preamp or FM tuner. The playback mechanism floats on springs within, minimizing the transmission of vibration to the spinning disc, ensuring secure tracking even in the presence of the powerful vibrations produced by your loudspeakers.

The output circuit in this player exemplifies the "less is better" approach, with only a handful of electronic components in the signal path. The elegantly simple analog stage has only one active circuit in each channel; a high-speed filter that provides de-emphasis and removes unwanted ultrasonic noise. To ensure that this active filter circuit cannot be overdriven into transient distortion, the analog signal is pre-smoothed by a passive multipole filter that is connected directly to the digital de-multi-plexer. High-quality polypropylene capacitors are used at sonically critical points in the circuit, e.g., in the treble de-emphasis network.

Type:  CD player with optical pickup
Quantization:  16-bit linear
Channels:  2 channels (stereo)
Frequency Response:  5 Hz - 20 kHz ±0,5 dB
Dynamic Range:  94 dB
Total Harmonic Distortion:  0,004$ 91 kHz)
Channel Separation:  90 dB
Wow and Flutter:  unmeasurable
Output:  2,0 V
Pickup:  Semiconductor laser
Track Search;  by track number
Power Consumption:  13 watts
Dimensions (W x H x D):  340 x 57,5 x 309,5 mm
Weight:  2,9 kg

Sanyo FMT-301K tuner

FM Tuner Section
Tuning Frequency Range:  88 MHz to 108 MHz
Usable Sensitivity (IHF)
Mono :  3,0 µV
Stereo :  6,0 µV
IF Rejection:  80 dB
Image Rejection:  50 dB
AM Suppression:  50 dB
Capture ratio:  1,0 dB
Selectivity (IHF):  50 dB
Signal-to-Noise Ratio
Mono :  65 dB
Stereo :  63 dB
Harmonic Distortion
Mono :  0,2%
Stereo :  0,5%
Stereo Separation (at 1 kHz):  40 dB
AM  Tuner Section
Tuning Frequency Range:  535 to 1,605 kHz
Usable Sensitivity:  400 µV
IF Rejection:  35 dB
Image rejection:  40 dB
Selectivity (IHF):  40 dB
Signal-to-Noise Ratio :  55 dB
General Section
Power Source:  AC 110/ 120/220/240 V 50/60 Hz
Power Consumption:  11 W
Dimensions (W x H x D):  400 x 255 x 135 mm
Weight:  3,5 kg

Koss CM-1010 loudspeaker

No other 2 bandbass speaker system can match the CM/1010's extended bandwidth response, high efficiency and unbelievably low distortion performance. And that's true at any size and at any price range. Once you've heard the unequaled Sound of koss in the CM/1010 you'll know for certain that our computerized Koss theory helped to make the optimum 2 bandpass speaker a reality. The CM/1010's unique passive radiator enhances the lower two octaves of the bass and allows for the use of a specially-designed 8-inch woofer to reproduce the critical midrange. A high-energy 1-inch dome tweeter produces the high-est energy output and lowest distortion of aany tweeter currently available. And an exclusive crossover network adds the finishing touches to the finest 2 band-pass loudspeaker system available today.

Component Array: 
10" mass aligned acoustic filter (passive radiator)
8" parameter synthesized woofer
1" acoustically loaded dome tweeter
Bandpass Response (to typify the normal listening room situation):
Low frequency 3 dB down point.
Alignment mass in 35 Hz.
Alignment mass out 42 Hz
High frequency 3 dB down point 17,5 kHz
Overall system response for 6 dB down points 32 Hz to 18,5 kHz mass in 39 Hz to 18,5 kHz mass out
Polar Response:  -3 dB at 8 kHz;  -6 dB at 10 kHz
Intermodulation Distortion products:  less than 2%
Reference Sensitivity:  90 dB SPL
Recommended Amplifier Power Rating (8 Ω):  15 watts/channel (minimum); 100 watts/channel (maximum)
Crossover Network:  3500 Hz
Nominal :  6 Ω
Minimum :  4 Ω
Input power Overload Protection:  Fused 3 AG 2A
Dimensions (W x D x H):  15-1/2" x 11" x 28"
Weight (Net):  44 lbs

Onkyo F-5000 loudspeaker

Onkyo model F-5000 Phase Aligned Array Speaker System
3-Way, 3-Speaker, Acoustic Suspension System with Planar Woofer, Planar Midrange, and Direct Drive Membrane Tweeter.

By now, most audiophiles understand the importance of phase accuracy. During a live performance all the notes - or frequencies - produced by the musicians have specific phase (time) relationship to each other. And the many overtones  - harmonics -  within each note also have specific orders in time and strength. If these subtle musical phase relationships are confused or lost, so is true fidelity.
Loudspeakers, because they operate simultaneously in the separate worlds of electronics, mechanics and acoustics, have the worst problem with phase accuracy. And the most difficult to correct, in the attempt to correct for phase aberations, speaker manufacturers have produced an odd assortment of peculiarly shaped enclosures and driver configurations. But these half-measures create as many problems as they solve.
Only Onkyo provides a total solution to the phase problem. The Onkyo Model F-5000 Phase Aligned Array is  a three way system whose individual drivers are inherently phase accurate because of their radically difierent - and technologically superior - construction.

The tree planar (flat-diaphragm) drivers in the Model F-5000 were developed through laser interferometry and computer analysis of the phase randomizing break-up modes in conventional driver cones. Onkyo's solutions for the F-5000 are emboded in the diaphragms of the 12" bass and 4" mid-range drivers. They consist of essentially flat annularly ribbed polyurethene/felted paper patented laminations that are inert, stiff, and yet have exceptionally low mass.
The critical high-frequency reproducer (DDM - Direct Drive Membrane) in the F-5000 employs an extremely thin and light polyamide memnrane. The result is electrostatic-like clarity, definition and center imagery, without the typical electrostatic drive problems.
The computer-developed crossover network, designed for the required phase characteristics, employs only air-core inductors and Mylar capacitors.
Onkyo's efforts and quality construction have resulted in smooth, wide frequency response, flat amplitude and precise linearity. Thus, the sound waves that come out of the system are almost mirror images of the sound waves that go into them. The overall effect is one of clarity and transparency delivered from a unit that looks as good as it sounds.

Phisical Spec:
Max Power handling:  100 W
Impedance:  6 Ω
Dimensions (H x W x D):  31-1/8" x 19-5/16" x 10-1/4"
Weight:  approx.54 lbs 

Optonica CP-2511 HW

3-Way Mini Speaker System
Maximum input power:  120 W
Extra-large magnets are incorporated in all three drivers in this mini speaker system to ensure exceptional reproduction across a wide frequency range with high efficiency and low distortion. The high-quality 16,9 woofer is surrounded by a soft foam "collar" that ensures a flat response across the entire frequency range. The 3,0 cm soft dome midrange and 2,5 cm soft dome tweeter are designed to provide undistorted sound at required volume levels with a high degree of sensitivity. The combination of this dome construction and extra-large magnets also serves to improve directional characteristics in this quality mini speaker system.

Type:  3-way closed type
Woofer :  169 mm
Midrange :  30 mm
Tweeter :  25 mm
Power Handling Capacity
Music Input Power (DIN 45 500) :  120 W
RMS Input Power (DIN 45 573) :  70 W
Rated Impedance:  4 Ω
Frequency Response (DIN 45 500):  40 - 23,000 Hz
Sensitivity (at 98 dB/1m) :  10,7 W
Sound Pressure Lewel (1W/1m):  85 dB
Crossover Frequency:  1,2 kHz; 4,5 kHz
Resonsnce Frequency:  90 Hz
Volume:  9,7 litre
Dimensions (W x H x D):  350 x 230 x 195 mm
Weight:  6,8 kg
Front Grille :  detachable
Cabinet :  walnut finish

Optonica CP-2311HW

2-Way Mini Speaker System.
Maximum input power:  100W
The CP-2311 HW delivers constant, undistorted reproduction that is of unusually high quality for a speaker system of this size. The special design of the extra-large magnets used in the 2,5 cm tweter and 12,7 cm woofer ensures high efficiency plus low distortion. The soft-dome tweeter was developed to deliver sound at the desired volume level without distortion. This construction also acts to improve directional characteristics. Superior reproduction in the low and mid frequency ranges is also ensured by the soft PVC :collar" that surrounds the high-efficiency woofer in this mini speaker system

Type:  2-way closed type
Woofer :  127 mm
Tweeter :  25 mm
Power Handling Capacity
Music Input Power (DIN 45 500) :  100 W
RMS Input Power (DIN 45 573) :  50 W
Rated Impedance:  4 Ω
Frequency Response (DIN 45 500):  45 - 23,000 Hz
Sensitivity (at 98 dB/1m) :  14,8 W
Sound Pressure Lewel (1W/1m):  83,5 dB
Crossover Frequency:  1,8 kHz
Resonsnce Frequency:  80 Hz
Volume:  4,8 litre
Dimensions (W x H x D):  300 x 130 x 160 mm
Weight:  4,0 kg
Front Grille :  detachable
Cabinet :  walnut finish

BIC T-4M cassette deck

T-4M Two-speed cassette deck
3-Head Dual Capstan, MPU Control, Bias Trim, Metal Tape

At 1-7/8, it outperforms other assette decks. At 3-3/4, it's in the open-reel class. BIC introduces the T-4M. With full-metal tape capability, and performance so unpecedented it puts cassette technology on a new plane. Thanks to BIC's eclusive broadband Electronics, at 1-7/8 ips the T-4M ranks with the world's finest cassette decks. At 3-3/4, it challenges even expensive open-reel machines. The number speak for themselves; guaranteed frequency response of 20 Hz to 23 kHz ±3 dB at 3-3/4 on 70 µSec tape (20 Hz to 21 kHz at 1-7/8).
Type:  Front loading Vertical type
Input power:  40 watts max
Input:  Line 250 mV
Mic :  3 mV
Line :  2,0 V ±2 dB
Headphone :  200 mV
Wow and Flutter:  4,76 cm/sec ±2%
Fast Forward and rewind Time:  47 sec. Typical
Frequency Response:  31,5 Hz to 14 kHz
Rec/Play :  two gape one housing combination Ferrite core
Erase ;  Double gap Sen-Alloy head
Capstan Motor:  Two speed electrical Governor Controlled DC Type
Reel Motor:  Mechanical Governor Controlled DC Type
Level meter:  45 dB full scale LED peak meter
Tape Counter:  3 digits LED Digital Type
Power Requirement:  105 to 132 V AC, 50.60 Hz
Dimensions (W x H x D):  440 x 164 x 257 mm (17-1/3 x 6-1/2 x 10-1/10 inch)
Weight:  8,4 kg (18,5 lbs)

ADC Sound Shaper Three equalizer

ADC has four Sound Shaper frequency equalizers that will improve your sound system. No matter how good it is. And at a cost that's lots less than trading in your components.
ADC Sound Shaper will improve your speakers. By extending thr true bass response, including the critical mid bass. ADC Sound Shaper will improve the relationship between your cartridge and speakers. From one of partial incompatibility to total compatibility.
They'il also eliminate rumble (low frequency overload), tape hiss and record scratches. And that only scratches the surface of what ADC Sound Shapers can do. For instance, the walls, carpeting and furniture of your listening room physically bounce sound around so that some spots have less sound than other spots. Lots less. ADC Sound Shapes will bring these "dead" spots to life.
Perhaps best of all, though, is a Sound Shaper's ability to let you re-equalize what a recording engineer mixed. If a horn section is overwhelming a piccolo, for example, you just slide the appropriate frequency lever. Presto, more piccolo. You can also vanquish a voice. Or boost a tube. Sound Shapers segment the entire spectrum of sound. To let you re-shape a sound track to your personal musical preferences. It's all the control you've ever dreamed of but never dreamed possible.
To get into equalizers, start with our Sound Shaper One which operates in five frequency ranges. Or our Sound Shaper One Ten which gives you greater control by operating in ten frequency ranges.
For more professional equalizers, there's our Sound Shaper Two MkII which functions in twelve frequency ranges with a two-channel LED meter And there's our new Sound Shaper Three Paragraphic Equalizer.
It combines all the advantages of a graphic equalizer with all the advantages of a perametric equalizer. Twelve primary frequency controls per channel. Plus twenty-four ancillary control positions per channel. The Sound Shaper Three is the ultimate in controlling and creating with your stereo system.
Take the ultimate step up in sound, without trading in a thing.

How To Trade Up Your Receiver, Tuner, Amplifier, Turntable, Cartridge And Speakers Without Trading In A Thing

Hitachi SR-1100 receiver

AM/FM Tuner Amplifier
No effort has been spared,no detail overlooked to make this one of the finest tuner amplifier available anywhere. From its FET equipped FM front end to its spring-loaded, one touch speaker trminal, every circuit and control has been designed with typical Hitachi fastidiousness. Accurate tuning is easy with signal strength and centre-zero tuning meters, and a muting control eliminates FM squelch. Further accuracy and clarity are guaranteed by ceramic filters and a time switching MPX decoder.

Auxiliary Circuits
Power and speaker (A, B) switch
Function switch, including muting switch
Mono-stereo switch
Loudness and High, Low filter switch
Tape monitor switch
Phono sensitivity switch
FM aerial attenuator
Headphones and Microphone socket

FM Section
Frequency Range:  88 - 108 MHz
Usable Sensitivity:  1,6 µV
Total Harmonic Distortion
Mono :  0,3% (1 kHz)
Stereo :  0,8% (1 kHz)
Image Rejection:  85 dB
IF Rejection:  100 dB
Capture Ratio:  0,8 dB
Stereo Separation:  42 dB (1 kHz)
Signal-to-Noise Ratio:  70 dB
Alternate Channel Selectivity:  65 dB
Aerial Impedance:  300 Ω
AM Section
Frequency Range:  530 - 1605 kHz
Usable Sensitivity:  10 µV
Image rejection:  73 dB
IF Rejection:  76 dB
Signal-to-Noise Ratio:  48 dB
Audio Section
RMS Power Both Channel Driven: 
65 W x 2 at 4 Ω, T.H.D. 0,5%
55 W x 2 at 8 Ω, T.H.D. 0,5%
Frequency Response:  20 - 50,000 Hz
Power bandwidth:  20 - 30,000 Hz
Distortion:  0,05% (1 kHz)
Signal-to-Noise Ratio:
Phono  Low :  65 dB
Phono High :  70 dB
Aux :  85 dB
Damping Factor:  50
Input Sensitivity:
Phono Low :  1,8 mV
Phono Hgh :  4 mV
Aux :  125 mV
Mic ;  2 mV
Tape Monitor :  500 mV
Main In :  800 mV
Output Sensitivity Rec Out :  500 mV
Tone Controls:
Bass :  ±16 dB at 50 Hz
Treble :  ±16 dB at 15 kHz
High Filter :  -10 dB at 10 kHz
Low Filter:  -8 dB at 50 Hz
Loudness (Volume at -30 dB):  +10 dB at 50 Hz ; +4 dB at 10 kHz
Dimensions (W x H x D):  446 x 137 x 330 mm (17-1/2" x 5-3/8" x 13")
Weight:  12,6 kg (27,8 lbs)

JVC JL-F30 turntable

 Fully Automatic Belt-Drive Turntable
Fully automatic Lead-in, Repeat, Return and Shut-Off
Four-pole synchronous motor
Proven Belt-drive system
New gimbal support

Cost and performance. The relationship between these two factors has always been a headache to designers/engineers. At JVC our engineers tried to create -and did - a balanced turntable in the JL-F30 for any serious audiophile, using our own 4-pole synchronous motor and the proven belt-drive system. It's no surprise that it has a low wow and flutter of less than 0,06% (WRMS) and a high Signal-to-Noise Ratio  of better than 67 dB (DIN-B). With the fully automatic convenience, the JL-F30 offers more performance for less investment than other automatic on the market.

The JL-F30's fully automatic mechanism allows manual operation at any time during play. An oil-damped arm up/down lever (CUE) is provided, so that you can cue on any of the selections on a record, regardless of arranged sequences.

The 4-pole synchronous motor spins the aluminum platter through the linkage of a belt-drive system. Vibration is filtered out and speeds are kept steady against power voltage fluctuations or load changes. JVC quality control is evident throughout this unit. The unit also offers the benefits of a low-silhouette design, making it perfect for any home decor, solid cabinet construction. Parallel isolating Suspension and other features.
Drive System:  belt drive system
Drive Motor:  4-pole synchronous motor
Speeds:  33- and 45 rpm
Wow and Fluttr:  less than 0,06%(WRMS)
Signal-to-Noise Ratio:  better than 57 dB (IEC-B) or 67  dB (DIN-B)
Platter:  die-cast aluminum alloy
Diameter:  309 mm (12-inch)
Type:  statically-balanced S-shaped tubular arm with JVC developed TH balancing system and with tracking force dial of 0,5 g/steps
Effective Arm Length:  220 mm
Tracking Error:  +3°35'; -0°43'
Overhang:  15 mm
Applicable Tracking Force range:  0,5 to 3 grams
Mountable Cartridge:  14,5 - 22,5 g (including Headshell)
Type:  Moving magnet MD-1025
Stylus:  0,5 mil diamond for DT-Z1S
Optimum Tracking Force:  1,5 to 2,0 grams (DT-Z1S)
Output:  3 mV (1 kHz)
Frequency Response:  10 to 25,000 Hz (DT-Z1S)
Separation:  better than 25 dB (1 kHz)
Load Resistance:  47 to 100 k Ω
Compliance:  25 x 10¯⁶cm/dyne (Static); 10 x 10¯⁶cm/dyne (Dynamic)
Power Source:  120, 220, 240 V 50/60 Hz
Power Consumption:  13 watts
Dimensions (W x H x D):  460 x 368 x 130 mm (18-1/8 x 14-1/2 x 5-1/8 inch)
Weight:  7 kg (15,4 lbs)

H.H. Scott 390R

Scott's new 390R is perhaps the most complete receiver ever made. A professional control center for your entire sound system, the 390R delivers a full 120 watts per channel (min. RMS, 8 Ω 20-20,000 Hz no more than 0,03 T.H.D.). And it offers more options, features and flexibility than you 'll find on most separates.
DC configuration OCL power amplifier with fully complementary output stage.
Bimodal electrosensor relay protection and delay circuit with LED indication.
Differental current mirror loaded low noise input stage.
Centaer channel and signal strength tuning meters
18 LED Analog to Digital logarithmic power display indication calibrated in watts and dBW
3 stage IF amplifier incorporating 3 linear phase ceramic filters with differential limiter and quadrature detector
LED function indicators
Connections for 3 pair of speakers
2 phono input
5 gang FM tuning capacitor with twin stage dual gate MOS FET TRF amp
Multiplex filter

FM Tuner Section
Tuning Range:  87,5 to 108 MHz
IHF Sensitivity:  9,8 dBf/ 1,7 µV
50 dB Quieting Sensitivity:
Mono :  15,6 dBf/3,3 µV
Stereo :  35,6 dBf/33 µV
Signal-to-Noise Ratio(at 65 dBf):
Mono :  80 dB
Stereo:  75 dB
Distortion (at 65 dBf):
Mono :  0,15
Stereo :  75 dB
Frequency Response:  25 Hz - 15 kHz (±2 dB)
Capture Ratio:  1,0 dB
Alternate Channel Selectivity:  80 dB
Image Rejection:  90 dB
Stereo Separation at 1 kHz:  50 dB
Spurious Response Rejection:  100 dB
Subcarrier rejection:  74 dB
IF Rejection (98 MHz):  100 dB
AM Section Tuner
Tuning Range:  515 to 1620 kHz
Usable Sensitivity (bar antenna):  150 µV/m
Signal-to-Noise Ratio:  55 dB
Selectivity ( 1Mhz):  500 dB
Image Rejection:  60 dB
Amplifier Section
Minimum Continuous RMS Output Power Per Channel (both channels driven into 8 Ω from 20 Hz to 20 kHz with no more than rated T.H.D. :  120 watts
Total Harmonic Distortion at Rated Output:  0,03%
Total Harmonic Distortion at 10 Watts, 20 Hz - 20 kHz :  0,015%
IMD at Rated Output:  0,03%
Input Sensitivity:
Phono 1 :  2,5 mV/5 mV
Phono 2 :  2,5 mV/5 mV
Others :  150 mV
Signal-to-Noise Ratio Weighted , Input Shorted
Phono :  90 dB (re: 10 mV RIAA 1 kHz)
Others :  95 dB
Frequency response:
Phono :  20 Hz - 20 kHz ±0,5 dB (RIAA)
Others at 1 watt :  20 Hz - 20 kHz ±0,5 dB
Phono Overload:  300/600 mV
Tone Control Range:
Bass :  ±10 dB at 100 Hz
Mid :  ±6 dB at 1 kHz
Treble :  ±10 dB at 10 kHz
High :  8 kHz 12 dB /oct
Subsonic :  18 Hz  12 dB/oct
Loudness Compensation at -30 dB
=3,5 dB at 10 kHz
+7 dB at 100 Hz
Channel Separation:
Phono 1 kHz :  70 dB
Others 1 kHz :  75 dB
Crosstalk (1 kHz):  75 dB
Damping Factor (1 kHz)  8 Ω:  better than 100
Line Voltage and Frequency
US/canada :  117 V AC 60 Hz
Europe :  100 V, 117 V, 220 V, 240 V switchable 50/60 Hz
Power Consumption:
US/Canada :  320 watts
Europe ;  800 watts
Dimensions (W x H x D):  580 x 165 x 400 mm (6-1/2" x 22-7/8" x 15-3/4")
Weight:  22,3 kg (49,0 lbs)

Aiwa AX-7800 receiver

DC Stereo receiver with Digital Quartz Synthesiser Tuning

Now Aiwa proudly introduces an exceptional high fidelity receiver designed to make tuning faster, easier and more accurate than ever; the revolutionary new AX-7800. with the same quartz locked digital-synthosized tuning system utilized on the most sophisticated and expensive FM tuners available today.
Now perfect tuning is as simple as pressing a button There's no more fumbling or fidgeting with tuning knobs, dials and center tuning meters. The new Aiwa AX-7800 simply doesn't have any.
Instead, it provides an instant digital readout that's perfectly tuned to the actual station frequency being received.
Drift is impossible. Because Aiwa's quartz crystal oscillator locks instantly and precisely into the center of each succeeding station's assigned frequency. Now when you tune the Aiwa AX-7800, you stay tuned. With unerring accuracy that even separates weaker stations from their stronger neighbors. Something no conventional receiver with AFC can do.

Aiwa's new AX-7800 is loaded with features; like memory Tuning that lets you preset up to 6 FM and 6 AM stations. Like a highly visible 9-point LED peak power bar graph. Like independent bass and treble frequency turnover controls.
And the AX-7800's DC-power amplifier gives you 60 Watts per channel RMS at 8 ohms from 20 Hz to 20 kHz, with no more than 0,05% T.H.D.
Right now, almost no receivers have all these advanced features.
Quartz PLL synthesizer tuning
Automatic tuning
Manual scan selection
Auto search hold tuning
Direct selector key

DC amplifier design means optimum sound quality at all frequencies
By the use of classic DC design in the power amplifier section, deterioration of low-frequency sound components due to phase shift is largely avoided, giving the AX-7800 superbly flat reproduction characteristics all the way down to DC (0Hz). Total Harmonic Distortion is kept to a completely inaudible 0,05% from 20 to 20,000 Hz at rated output, and the 3-stage differential amplifier circuit also assures superior signal-to-noise performance from tuner, turntable orother sources.

High performance equalizer amplifier.
Employing a newly developed plus-minus split power supply IC, the dual FET differential amplifier used for phono cartridge reproduction assures close adherence to the RIAA reference curve, as well as a high signal/noise ratio of 80 dB. The 200 mV maximum phono input provides dynamic margin with any type of high quality MM cartridge.

FM Tuner Section
 usable Sensitivity:
Mono :  10,8 dBf (1,9 µV)
Stereo : 17,2 dBf (4 µV)
50 dB Quieting Sensitivity:
Mono :  17,2 dBf (4 µV)
Stereo :  36,0 dBf (35 µV)
Signal-to-Noise ratio:
Mono :  75 dB
Stereo :  70 dB
Capture Ratio:  1,5 dB
Alternate Channel Selectivity:  70 dB (±400 kHz)
Image Rejection:  75 dB
IF Rejection:  90 dB
Spurious Rejection:  100 dB
AM Suppression: 55 dB
Total Harmonic Distortion
Mono :  0,4% (at 1 kHz)
Stereo :  0,5 5 (at 1 kHz)
Frequency Response:  30 - 15,000 Hz (+0,5 -2 dB)
Stereo Separation:  4 dB at 1,000 Hz
Subcarrier Suppression :  57 dB
Antenna Terminals:  300 Ω (balanced), 75 Ω (unbalabced)
AM Tuner Section
Sensitivity (External antenna)
3 Band Type :  30 µV
2 band Type :  25 µV
Signal-to-Noise Ratio:  55 dB
Selectivity:  30 dB
Image Rejection:  50 dB (at 1,000 Hz)
IF Rejection:  35 dB (at 1,000 Hz)
Power Amplifier Section
Continuous power Output:  60 W x 2 (20 Hz - 20 kHz, T.H.D. 0,05%)
Total Harmonic Distortion:  0,05% (at effective power output 8 Ω)
IM Distortion:  0,05%
Damping Factor:  50 (8 Ω)
Residual Noise:  0,5 mV 98 Ω)
Preamplifier Section
Input Sensitivity/Impedance
Phono 1 :  2,5 mV / 47 k Ω
Aux 1 :  150 mV / 47 k Ω
Tape 1 :  150 mV / 47 k Ω
Phono Overload:  200 mV 91 kHz, THD0,1%)
Frequency Response:
Phono :  30 Hz - 15 kHz ±0,5 dB
Aux, tape :  10 Hz - 50 kHz  +1 -3 dB
Tone Control Range
Bass :  ±6 dB at 100 Hz (Turnover Frequency 200 Hz); ±9 dB at 100 Hz (Turnover Frequency 400 Hz)
Treble :  ± 9 dB at 10 kHz (Turnover Frequency 2,5 kHz); ±6 dB (Turnover Frequency 5 kHz)
Loudness Control:  9,5 dB (100 Hz); 12 dB (10khz)
Signal-to-Noise Ratio: 
Phono :  80 dB
Aux, Tape Input:  100 dB
Power Supply:  120, 220, 240 V; 50/60 Hz
Power Consumption:  160 W
Dimensions (W x H x D):  500 x 120 x 440 mm (19-11/16" x 4-3/4" x 17-3/8")
Weight:  10,5 kg (23,1 lbs)

Pioneer PL-4 turntable

The PL-4 is an Auto-Return Turntable. All it's essential controls - speed, pitch control 9with strobe) and cut - are grouped on the slanted front edge. Placing a record on the platter and moving the tone arm over to it is all that is necessary to enjoy record play. There's no need to physically touch the tone arem at any other time. The arm automatically returns to its rest when play is over. Even arm cueing is provided by an arm elevation device located at the base of the arm.
The arm is straight-contoured and constructed of low-mass PG (polymer Graphite). It is rigid, resistant to resonance, and lightweight. Record warps, eccentricties and cartridge/arm resonance pose no obstacles to accurate tracking. Sensitivity is increased by the low-mass design and distortion is measurably reduced.
The PL-4 employs the Pioneer coreless DC servo motor with Stable Hanging Rotor. Designed without cores, slots and brushes, it offers the smoothest cog-free rotation. Because of electronic switching by hall elements, it does not generate switching noise and years of reliable performance are assured. Mated with this advanced motor is an equally precise periphery integration speed detection circuit. It compensates for the minutest error in rotational speed four hundred times per second. The result is impeccable short-term and long-term speed accuracy.
Both the delicate cartridge and the tone arm are protected from acoustic feedback by the Coaxial Suspension system which mounts the motor and arm on a separate subchassis. Neither air-borne nor floor-borne vibrations are capable of affecting the tone arm, its base is isolated from the cabinet and suspended by four spring-loaded feet.
All in all, the PL-4 is a tough act for any competitive model in the same price range to follow because of its high-value features and top-flight specifications.

Drive System:  Direct-drive
Motors:  Coreless DC-Servo motor Hanging Rotor, Hall-motor
Speeds:  33-1/3 and 45 rpm.
Wow and Flutter (WRMS): 
No more than 0,025%;
No more than 0,014% (measured directly from FG output)
Signal-to-Noise Ratio (BIN B):  more than 78 dB
Tone-arm Type:  Static-balanced low mass Polymer Graphite straight pipe arm
Effective Arm Length:  221 mm (8-11/16 inches)
Overhang:  15,5 mm (5/8 inches)
Usable Cartridge Weight:  3 g  to 8 g
Power Requirement:  120 V 60 Hz
Power Consumption:  12 watts
Dimensions (W x H x D):  420 x 108 x 367 mm (16-9/16" x 4-1/4" x 14-7/16")
Weight:   5,8 kg (12 lbs 13 oz)

AVID model 103 loudspeakers

The most popular of the 100 line, the 103's are praised by our own Big Al. It's three-way air suspension bookshelf design employing a 10" woofer, a 4-1/2" midrange driver and a superb 1" dome tweeter. 3 drivers enable this unit to achieve extended bass and high frequency performance while ensuring excellent dispersion characteristics and stereo imaging over the entire frequency range. The 103 is a truly accurate loudspeaker that is capable of handling up to 150 watts of program material yet requires no more than 20 watts for most listening environments.

Type:  three-way system
Impedance [nominal/minimum]:  8 Ω / 6 Ω
Recommended Amp. Power:
Minimum :  20 Watts
Maximum:  150 Watts
Frequency Range:  35 Hz to 18,000 Hz ±5 dB
Driver Complement:
Low Frequency :  10" Air Suspension
Mid Frequency :  4-1/2" Air Suspension
High Frequency :  1" Dome
Crossover Frequencies:  500 Hz and 3,500 Hz
Net Weight:  38 lbs