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





Fisher DD-280 cassette deck

Fisher Direct Drive … the most technically advanced tape drive system
In the new Fisher DD280 cassette deck, Fisher has replaced the conventional belt-drive system with a high-torque 18-pole brushless, coreless, direct drive DC flywheel motor. The motor shaft is the tape transport capstan itself. The result is a silent, one-piece direct drive system that glides at a stable 360 rpm. Wow and Flutter: are reduced to an incredibly low 0,04%. Gone forever are belt wear problems resulting in speed change, belt breakage and replacement. For long term reliability direct drive is the answer.
Feather touch electronic solenoid controls.
Don't look for "clunky" levers on the DD280. transport functions are actuated by sensitive solenoid electronic switching. IC logic circuitry assures instant, positive action. You can go directly from rewind to fast forward to play, without having to manually stop between functions. LED indicators signal mode of operation.
Metal tape compatibility.
The DD280 is also metal tape compatibile. The new metal particle tapes offer a marked improvement in Signal-to-Noise ratio and dynamic range over previous tape formulation. With its metal EQ and bias settings, plus high performance MX/Ferrite heads, the DD280 produces tapes of stunning accuracy. With metal tape, the DD280 delivers an impressive frequency response of 30 Hz - 20 kHz.
Low in profile. And high on features
The low-profile DD280 has everything you'd expect in a professional-quality cassette deck. Calibrated input level controls. Dolby Noise Reduction. Large scale dual-range VU meters. Peak level LED indicators and more.
It's what you'd expect from the new Fisher.
Fisher invented high fidelity from many years, and never stopped moving ahead. The new DD280 is a perfect example. Part of the new Fisher. Where the only thing about us that's old is our dedication to quality and craftsmanship.


H.H. Scott 386 receiver

 Featuring such sophisticated technological advances as electronic circuit protection and electronically regulated power supply, the new Scott 386 AM/FM stereo receiver is a new landmark in the field of audio engineering. High usable power and carefully considered design make the 386 the only choice for the experienced audiophile.
Scott guarantees at least this level of amplifier performance - Massive power transformer and Full Complementary Output circuitry give maximum undistorted power at all audible frequencies.
Instant-acting electronic overload protection - Unlike conventional thermal cutouts, Scott's new protective circuit releases the drive when too much current flows through the output transistors. A circuit-breaker will also trip under prolonged short circuit conditions at high power. There are no fuses to burn out.
Ultra-reliable space-age circuitry - Permanently aligned quartz crystal filter IF, FM amplifier, and four Integrated Circuits (including Perfectune logic module) are included in this small area.
AM reception virtually indistinguishable from FM - New Integrated Circuit AM front end features pre-tuned multi-pole filter for optimum AM fidelity.
Instant-information panel indicator lights - let you know at a glance whether you're receiving AM or FM, stereo or monaural broadcast, Scott Perfectune indicator tells when you're perfectly tuned for best reception.
New connection techniques eliminate solder joint failures - Wire-wrap terminal connections plus plug-in module construction result in the kind of reliability associated with aerospace applications.
Other features:
New illuminated dial results in increased visibility
New muting circuit eliminates noise between FM stations
Plug-in speaker connectors eliminate phasing problems
Silver-plated Field Effect Transistor front end receives more stations more clearly with less distortion
Integrated Circuit IF strip virtually eliminates all outside interference
Integrated Circuit preamplifier reduces distortion to inaudible levels
Full Complementary direct coupled all-silicon output circuitry provides effortless instantaneous power, with maximum reliability
Automatic stereo switching instantly switches itself to stereo operation
Specifications:
Power:  170 watts ±1 dB, IHF power spec. (at 0,8% T.H.D. both channel driven)
Dynamic Power:  67,5 watts/channel (at 4 Ω)
Continuous Power:  42 watts/channel (at 4 Ω);  35 watts/channel (at 8 Ω)
Frequency Response:  20 - 20,000 Hz ±1 dB
Selectivity:  40 dB
Hum and Noise (Phono):  -65 dB
Cross Modulation Rejection:  80 dB
Usable Sensitivity:  1,9 µV
Tuner Stereo Separation:  40 dB
FM IF Limiting Stages:  9
Capture Ratio:  2,5 dB
Signal-to-Noise Ratio:  65 dB
Input Phono Sensitivity:  3,6 mV
Dimensions (W x H x D):  17-1/2" x 5-1/2" x 15-3/4"
Weight:  20 lbs

Genesis 700 speakers

Genesis 700 Loudspeaker features:
The Genesis 700 is based on much of the same technology as found in Genesis Ireference System
Exceptional dynamic range and off-axis response
1,5" thick MDF front baffle and 1" thick MDF sides with heavy internal bracking
Newly-designed, dual 6,5" shielded metal-cone woofers
Twin 1" shielded circular-ribbon tweeters
Unique 4thorder Linkwitz-Riley phase-correct crossover loaded with custom genesis-designed parts
Designed to be equally at home in pure audio or home theater systems
Users adjustable music/video bass contour and tweeter level controls

The 700 incorporates two technologically-advanced and different driver designs to create its sonic magic. The bass and middle frequencies are handled by two shielded, custon-designed 6,5" long-throw metal-cone woofers, and the higher frequencies are reproduced by a shielded version of our famous 1" circular-ribbon tweeter, one in front and one in the rear.
The 700 can be used in either a horizontal position as a center channel,, or in a vertical mounting on either stands or wall mounts as the front, rear or main channels in a music or home theater system.
The crossover is a two-way, 4th order, Linkwitz-Riley phase-correct design that incorporates custom-wound Genesis capacitors, oxygen-free copper inductors and the finest parts available.
The design, quality of materials, and fit of the cabinet are critical to the performance of any loudspeaker. The 700 is unique in both its performance and its construction. Built from heavily-braced 1'-thick MDF for the sides, a 1,5" thick front baffle, and covered in either black ash or South American rosewood, the 700 can truly lay claim to a no-compromise approach.
Beacuse every room and listening situation is different it is not possible to design a loudspeaker that is perfect for every application. Knowing this, Genesis has continued in our tradition of offering you unmatched flexibility. In the rear of the 700, there are two controls, one for the tweeter level and one for music or video. The tweeter level control allows you to adjust the volume of the tweeter to perfectly match your tastes and your system. The music/video switch in the rear of the 700 allows the bass contour to be optimized for either application.

The Genesis 700 has exceptional dynamic range for a speaker of its size. It is capable of easily handling svral hundred watts of power and producing SPL levels approaching that of live music.
With a Frequency Response essentially flat from 48 Hz to 32 kHz, the 700 is a full-range loudspeaker for all but the lowest frequencies which, if necessary, can be augmented with the addition of a Genesis 900 subwoofer.

One of the most critical aspect of a loudspeaker's performance is the ability to maintain a flat energy response off-axis because we typically listen off-axis. The fact that a speaker is flat (in its acoustic energy output) on-axis is an attribute, but it is not as critical as its off-axis response. Very few loudspeakers ever achieve anything close the the level of smooth off-axis performance built into the 700. in fact, the off axis response of the 700 is so good it is often hard to tell where the speakers are in the room.

Specifications
Type:  2-way
Drivers: 
2 x 6,5"  long-throw metal-cone woofers
2 x 1" circular-ribbon tweeter (1 in front and 1 in the rear)
Nominal Impedance:  4 Ω
Frequency Response:  48 Hz to 32 kHz ±3 dB
Dimensions (W x H x D):  10,5" x 21,5" x 13"
Weight:  55 lbs (each no crate)

H.H. Scott 450R receiver

Stereo receiver with DC Power Amp
the 350R features a DC configuration OCL power amplifier for clear, clean sound and low distortion. the four gang FM tuning section and all silicon dual gate MOSFETs assures an extra-wide, low noise signal and superior FM reception. The 350R's dual wide range power level meters calibrated in watts and dBW indicate amplifier output at a glance, the MPX filter cancels unwanted FM noise
Features include: a stereo beacon; FM center chanel and AM/FM signal strength tuning meters; left and right output power meters calibrated 0,001 to 100 watts and -30 dB to +20 dBW for 8 Ω loads; automatic dubbing from one tape to another; and an output hold-off that prevents power supply turn-on transients from being fed to the speakers.
There are inputs for magnetic phono, aux, and two tape. Outputs fro two speaker systems, two tape, and phones.
Controls are provided for tuning, volume, ganged bass, ganged treble, input selection /FM MPX filter, and speaker selection. There are switched for FM muting, high filter, loudness compensation, mono-stereo mode, copy 9dub tape 1 to tape 2), and tape monitor selection.
The fM antenna input is 75 and 300 ohms. A rod antenna and external connection are provided for AM. There are switched and unswitched AC outlets.

Performance FM Tuner Section
Full mute release was attained with 5,5 µV. The monophonic high fidelity sensitivity (60 dB quieting) measured 7 µV. The stereo high fidelity sensitivity (55 dB quieting) was 75 µV. Full mute release was attained with 12 µV. At standard test level the stereo frequency response measured ±3 dB from 70 to 14,000 Hz, rising to +3,5 dB at 15,000 Hz. The monophonic distortion measured 0,65% T.H.D.  The stereo distortion was 0,95% to 0,8% depending on the tuning adjustment (the indicators permit a relatively broad center-channel tuning range). The Signal-to-Noise ratio (mono) measured 69 dB. Stereo separation was 32 dB. Selectivity was good.
AM Tuner Section - background noise was relatively higher than average
Amplifier Section
The power output per channel at the clipping level with both channels driven 20 to 20,000 Hz into 8 ohms measured 88 watts RMS. The Frequency Response at 88 watts, 8 ohms measured +0/-1,5 dB from 20 to 20,000 Hz at a distortion no higher than 0,06% T.H.D. at any frequency.
The tone control range measured +9/-11 dB at 50 Hz ; ±11 dB at 10,000 Hz
The magnetic input hum and nooise measured -62 dB, stereo separation was into the noise level.
The LED output power indicators are instantaneous and track the peak program level. Calibration is approximate. The frequency response is "flat" from 20 to 20,000 Hz in terms of a single LED staying lit across the entire band of test frequencies.
Overall dimensions measure (W x H x D): 17-3/4" x 5-1/4" x 11-13/16"
Weight:  24,5 lbs

Pioneer CT-501 cassette deck

Stereo Cassette Deck
Soft-touch Tape Control - for velvet-smooth operation
Dolby C-type noise reduction system - reduces noise by 19 dB at 5 kHz, extending the usable dynamic range considerably
One-touch recording - just a touch of the Record button is all that is necessary to start recording
Tape selectors - provide positions for all popular tape types; metal, chrome and normal-bias
LED lelev meters - facilitate the making of tapes with minimum noise and distortion
Timer standby - permits off-the-air recording in absentis
Dolby B-type noise reduction

Specifications
Type:  4-track, 2-channel recording and playback stereo cassette tape deck
Motors :DC servo motors
Heads :
1 x Hard permalloy  rec/pb head
1 x Ferrite erasing head
Fast Winding Time (C-60 tape):  110 sec.
Wow and Flutter (WRMS):  0,06%
Frequency Response
Normal Tape :  35 -13,000 Hz
Chrome Tape :  35 - 14,000 Hz
Metal Tape :  35 - 15,000 Hz
Signal-to-Noise Ratio (Dolby off):  57 dB
Total Harmonic Distortion (0 dB):  1,5%
Input Sensitivity/Impedance:
MIC :  0,3 mV/10 k Ω
Line :  50 mV/ 91 k Ω
Output Level/Impedance:
Line :  316 mV/3,9 k Ω
Power Requirements:  110 V, 120 V, 220 - 240 V AC, 50/60 Hz
Power Consumption: 16 watts
Dimensions (W x H x D):  420 x 120 x 238 mm (16-9/16" x 4-3/4" x 9-3/8"
Weight:  3,9 kg (8 lbs 10 oz)

Pioneer F-101T tuner

Quartz Digital Synthesizer AM/FM  Tuner - a tuner with a built-in programmable time/clock

Programmable Timer:  
A microcomputer controls the timer so that the tuner and connected equipment turn on at preset times. Up to three operations a day - two daily and one-time only
Digital and Analog Clocks:  
A colorful fluorescent panel shows time both in digits and by hands. The digital display doubles as a frequency display for the tuner
Digital Synthesizer Tuner:  
For top tuning accuracy and presents of 8 FM and 8 AM stations
Timer Setting Indicator:  
Present times are shown by lights ringing the analog clock
Sleep Timer:  
Set in 10-minute increments for up to 24 hours
Last Channel Memory:  
FM and AM stations last tuned are automatically tuned the next time the unit is turned on
Memory Backup for Station Frequencies

Specifications:
Usable Sensitivity (mono):  10,8 dBf (0,95 µV, 75 Ω)
50 dB Quieting Sensitivity
Mono :  17,3 dBf (2,0 µV, 75 Ω)
Stereo :  39,2 dBf (25 µV, 75 Ω)
Signal-to-Noise Ratio
Mono :  75 dB
Stereo :  70 dB
Total Harmonic Distortion
1 kHz Stereo :  0,2% ( at 65 dBf)
Frequency Response:  30 - 15,000 Hz +0,5 -2,0 dB
Capture Ratio:  1,0 dB
Alternate Channel Selectivity:  70 dB (400 kHz)
Stereo Separation: 40 dB (1 kHz)
Antenna input:  300 Ω (balanced), 75 Ω (unbalanced)
AM Section
Sensitivity (IHF, Loop Antenna):  250 µV/m
Signal-to-Noise Ratio:   50 dB
Antenna:  loop antenna
Audio Section
Output level/Impedance:
FM (100% mod. Fixed):  650 mV/7 k Ω
AM (30% mod. Fixed):  150 mV/7 k Ω
Power Requirements:  110 V, 120 V, 220  - 240 V, 50/60 Hz
Power Consumption: 15 watts
Dimensions (W x H x D):  420 x 60 x 317 mm (16-9/16" x 2-3/8" x 12-1/2")
Weight:  3,6 kg (7 lb 15 oz)

Sansui R-70 receiver

Sansui R-70 is an AM/FM stereo receiver FTC rated 8ohms at 65 watts RMS per channel, 20 to 20,000 Hz, at a distortion no higher than 0,08% T.H.D. at any frequency
Features include a stereo beacon, three-step LED FM center channel tuning indicator, five-step LED AM/FM signal strength tuning indicator, leeft and right twelve-step LED output power indicators calibrated 0; 0,005; 0,01; 0,02; 0,05; 0,1; 0,5; 1; 2; 10; 50 and 80 watts into 8 ohms, and automatic copy (dub) from/to either of two recorders.
There are inputs for magnetic phono, Aux, and two tape. Outputs for two speaker systems, two tape, and phones.
Controls are provided for tuning, concentric-clutched left and right volume (labeled volume/balance), ganged bass, ganged treble, tape monitor/ copy selection, input selection and speaker  selection. There are switches for high filter, loudness compensation, and FM muting (auto for stereo, off for mono).
The FM antenna input is 75/300 ohms. An internal antenna and external connection are provided for AM. Switched and unswitched AC outlets are provided.
Performance
FM Tuner Section
Full limiting measured 6 µV. The monophonic high fidelity sensitivity (60 dB quieting) measured 13 µV. The stereo 55 dB quieting high fidelity sensitivity could not be measured because unusually high pilot and MPX subcarrier leakage blocked the test equipment at -38 dB. Full mute release was attained with 3 µV.
The stereo pilot and subcarrier leakthrough is high and requires the use of an MPX filter when recording with Dolby. This is no problem since all Dolby noise rduction systems have the MPX filter; if yours is switchable make certain it is switched in.
At standard test level the stereo frequency response measured +0,5/-0,4 dB from 20 to 15,000 Hz. Monophonic distortion measured 0,18% T.H.D.; stereo distortion was 0,35% T.H.D.. The Signal-to-Noise ratio measured 75 dB . Stereo separation was +40 dB. And selectivity was is good.
AM Tuner performance - background noise level was higher than average.
Amplifier Section performance
The power output per channel at the clipping level with both channels driven 20 to 20,000 Hz into 8 ohms measured 43 watts RMS. The Frequency Response at 43 watts into 8 ohms measured +0/-0,6 dB from 20 to 20,000 Hz  at a distortion no higher than 0,065% T.H.D. at any frequency.
The tone control range measured +11/-12 dB at 50 Hz ; ±10 dB at 10,000 Hz
The magnetic input hum and noise measured -58 dB; stereo separation was into the noise level.
The output power meters are broadly calibrated - 1; 10; 100 watts, etc - and are reasonably accurate at the calibration marks. The Frequency Response of the meters is essentially "flat" 20 to 20,000 Hz, and can be relied on for tests if the reference is one of the fast rise and a slow decay, providing a form of semipeak indication.

Overall dimensions are:  16-15/16" (wide) 5-13/16" (high) 9-1-16" (deep)
Weight is 16,5 lbs

Technics ST-G460 tuner

Quartz Synthesizer Stereo Tuner
Features:
3 band 39-channel random access preset memory
Class AA output amp circuitry for signal transfer accuracy
Traditional Technics DC construction enhances waveform fidelity while extending flat frequency response all the way down to 4 Hz
Technics quartz synthesizer digital tuning usas an unwavering quartz crystal reference to prevent drift while promoting astounding accuracy and convenience
DC Linear Switching MPX reduces distortion and expands dynamic range
Large FL display
FM signal strength indicator
Auto-scan tuning and auto memory

Specifications
FM Sensitivity (S/N30 dB, 75 Ω) :  1,3 µV
Total Harmonic Distortion
Mono :  0,05%
Stereo :  0,1%
FM Signal-to-Noise Ratio
Mono :  72 dB ( 80 dB IHF)
Stereo :  65 dB (73 dB IHF)
FM Frequency Response:  4 Hz - 15 kHz +0,5 dB -1,0 dB
Alternate Channel Selectivity (±400 Hz):  65 dB
FM Stereo Separation (1 kHz):  50 dB
AM Sensitivity (S/N20 dB):  20 µV (MW); 50 µV (LW)
Output Voltage:  0,3 V
Power Requirements: 240 V 50/60 Hz
Power Consumption:  9 W
Dimensions (W x H x D):  430 x 69 x 288 mm
Weight:  2,5 kg

Technics SU-V460 amplifier

Stereo Integrated Amplifier
Features:
Class AA amp circuit for extra clean power, 2 x 45 W RMS 920 Hz - 20 kHz, 8 Ω). The Technics developed circuit Class AA stabilizes speaker drive while delivering high power with low distortion of 0,0009% 91 kHz, 8 Ω)
New ultra-pure "Power Amp Direct" input by passes the preamp section to provide Signal-to-Noise ratio improvement and maintain signal's purity
High Speed EX capacitors with high-purity electrolyte for transparent mid/high range quality
Heavy duty power supply
6-position multiple input facilities
"A" and/or "B" speaker selecction
Tone defeat switch, loudness switch, low-noise NFB type tone controls
6-position Rec selector
Black (K) or Silver (S) finish

Specifications
Continuous Power Output per Channel
From 20 Hz - 20 kHz (8 Ω, T.H.D. 0,005%) :  45 W
Into 1 kHz DIN (8 Ω, T.H.D. 0,0009%) :  60 W
Into 1 kHz DIN (4 Ω, T.H.D. 0,002%) :  85 W
Input Sensitivity
Phono :  2,5 mV/47 k Ω
Tuner, CD, Aux, Tape :  150 mV/22 k Ω
Direct In  IV :  18 k Ω
Frequency Response:
Phono :  RIAA ±0,8 dB
Tuner, CD, Aux, Tape :  20 Hz - 20,000 Hz (-0,2 dB); 3 Hz - 100,000 Hz (-3 dB)
Signal-to-Noise Ratio:
Phono :  76 dB ( 81 dB IHF A)
Tuner, CD, Aux, Tape :  97 dB
Direct :  106 dB
Power Requirements:  240 V 50/60 Hz
Power Consumption:  450 W
Dimensions (W x H x D):  430 x 125 x 320 mm
Weight:  8,0 kg

Kenwood KR-5010 receiver

Kenwood KR-5010 in an AM/FM stereo receiver FTC rated for 8 ohms at 45 watts RMS oer channel, from 20 Hz to 20 kHz , at no more than 0,03% Total Harmonic Distortion
Features include a stereo beacon, combination FM center-channel and AM signal strength tuning meter, left and right output power meters calibrated from 0,01 to 100 watts into 8 ohms and -40 dB to +3 dB with 0 dB representing 50 watts, wide and narrow FM IF bandwidth selector, an Fless than mute automatically applied in the auto stereo mode 9mute is always off in the mono mode), and an output hold-off that prevents power supply turn-on transients from being fed to the speakers.
There are inputs for magnetic phono and two tape. Outputs for two speaker systems, two tape, and phones.
Controls are provided for tuning, volume, balance, ganged bass, ganged treble, input selection, and speaker selection. There are switches for loudness compensation, hi-filter, tape monitor A, and tape monitor B.
The FM antenna inputs is 75 Ω/300 Ω. A rod antenna and external connection are provided for Am. Switched and unswitched AC outlets are provided.

Performance
FM Tuner - full limiting was attained with 1,6 µV. The monophonic high fidelity sensitivity (60 dB quieting) measured 7 µV. The stereo high fidelity sensitivity (55 dB quieting) was 55 µV. Full mute release was attained with 1,6 µV
At standard test level the stereo frequency response measured +0,1 dB / -1,5 dB from 30 to 15,000 Hz. With the receiver set for wide selectivity the distortion measured 0,15% T.H.D. for mono 0,6% T.H.D. for stereo. With narrow selectivity the distortion measured 0,11%  T.H.D. for mono, and 0,4% T.H.D. for stereo. The signal to noise ratio was 69 dB. Stereo separation measured 40 dB. Selectivity was fair (wide) to very good (narrow)
AM Tuner - distortion was a little higher than average
Amplifier - the power output at the clipping level with both channels driven 20 to 20,000 Hz into 8 Ω measured 43 watts RMS per channel. The Frequency Response at 43 watts/8 Ω was +0 dB/-0,2 dB from 20 to 20,000 Hz at a distortion no higher than 0,035% T.H.D. at any frequency
The tone control range measured +11 dB / -9 dB  at 50 Hzl +9 dB/-8 dB at 10,000 Hz
The magnetic input hum and noise measured -62 dB; stereo separation was into the noise level.
Within the power capabilities of the amplifier the power meters were within 10% accuracy at their calibrated values. Frequency Response was essentially "flat" from 20 Hz to 20,000 Hz

Overal dimensions (W x H x D): 18-1/2" x 5-1/2" x 14-1/8"
Weight :  19 lbs

Hitachi SR-4010 receiver

Hitachi SR-4019 AM/FM stereo receiver FTC rated for 8 ohms at 25 watts RMS per channel, 20 Hz to 20 kHz , at no more than 0,05% Total Harmonic Distortion
Features include:
Left and right 5 step LED output power indicators, calinrated at 0,01; 0,1; 1; 10 and 30 watts into 8 ohms, that also serve as an FM tuning indicator (left meter) and AM/FM signal strength meter (right meter); an FM stereo beacon; an FM mute that is applied automatically when the receiver is in the stereo mode (the mute is off when the receiver is set for full time mono); and a subsonic filtter that is applied automatically when the LED indicators are switched to the tuning indicator mode (the subsonic filter is off when the meters are switched to indicate output power)
There are inputs for magnetic phono, and tape Outputs for two speaker systems, tape and [phones. Controls are provided for tuning volume, balance, ganged bass, ganged treble, speaker selection, and input selection/FM muting. There are switched for loudness compensation, tape monitor, and meter mode/subsonic filter.
The FM antenna input is 75/300 ohms. An internal antenna and external connection are provided for AM. There is one unswitched AC outlet.
Tuner performance
FM Tuner. Full limiting was attained with 2,8 µV. The monophonic high fidelity sensitivity (60 dB quieting) measured 8 µV. The stereo high fidelity sensitivity (55 dB quieting) was 90 µV. Full mute release was attained with 6 µV. At standard test level the stereo frequency response measured +0,2/-1,5 dB from 40 to 15,000 Hz, down 2,2 dB at 30 Hz . Monophonic distortion measured 0,2% Total Harmonic Distortion, stereo distortion was 0,5% Total Harmonic Distortion. The signal to noise ratio measured 67 dB. Stereo separation was 36 dB. Selectivity was very good. The 19 kHz FM pilot leakthrough is some what higher than average. Make certain the MPX filter on a Dolby recorder is switched in when recording from FM. On most recorders the MPX filter is automatically applied with the Dolby.
AM tuner. Background noise was higher than average.
Amplifier peformance. The power output per channel at the clipping level with both chaannels driven 20 to 20,000 Hz into 8 ohms measured 27 watts RMS. The frequency response at 27 watts/8 ohms measured +0 dB -3 dB from 20 to 20,000 Hz at a distortion no higher than 0,06% Total Harmonic Distortion at any frequency. The subsonic filter produced 2,5 dB attenuation at 20 Hz. The tone control range measured =11/-12 dB at 50 Hz ; ±8 dB at 10,000 Hz. The magnetic input hum and noise was -69 dB; stero separation was into the noise level.
Meters
The LED output power indicators, because of the broad range between values, indicate approximate power. They serve as a reference rather than as precise value. Their frequency response is essentially "flat". When used as tuning meters the right indicator functions as light-bar )or bar-graph) signal strength meter, while the center LED in the left indicator serves to indicate proper tuning-it snaps on when an FM station is tuned properly; essentially, the LED substitutes for a center-channel tuning meter.


Dimensions (W x H x D):  17-1/8" x 4-3/8" x 11-1/8"

Boston A200 loudspeakers

The A200 is a high performance three-way loudspeaker system designed for optimum reproduction of music under actual home listening condition. Its design takes particular advantage of recent research about the colorations which can be caused by off-axis sound radiation when it reflects off parts of the speaker, is diffracted at cabinet edges, and is strongly reflected off floor and wall surfaces near the speaker.
These reflections have been controlled in the A200 by the shape of the cabinet and careful attention to the placement of the drivers, yielding a speaker system which exhibits a remarkably uniform and accurate tonal balance, exceptionally good stereo imaging, and relatively high efficiency.
The 10" woofer is mounted near the floor and the shallow cabinet permits convenient placement near a wall behind it. Consequently the woofer behaves acoustically as if it were flush-mounted at the floor-wall intersection, radiating uniformly into the 90-degree solid angle formed by that intersection with all reflections remaining in-phase with the woofer's direct output, preserving its smooth response and raising its efficiency.
The 4-1/2" midrange and 1" soft dome tweeter are positioned near  ear level for realistic musical imaging. They are flush-mounted in an unusually large and smooth front-panel area, so that the nearest cabinet edge or reflecting object is more than a half-wavelength away at any frequency in their operating range.  Consequently the drivers radiate essentially a hemispheric wave front, and the control of early reflections permits their smooth response to be heard to full advantage.

The infinite plane enclosure
The A200's enclosure design isn't a cosmetic "sales feature". It is calculated specifically to restrict the amount of sound than can reach the rear wall and floor, especially at the crucial midrange frequencies that determine a speaker's tonal character and imaging capability.
The A200's unusually large and smooth front panel makes the midrange and high frequency drivers behave as if they are mounted into an infinitely large plane extending beyond the baffle. As a result, they acoustically "see" only the hemispheric space in front of the cabinet, eliminating the early reflections that can color their sound and blur the stereo imaging.
Dealing with bass frequencies and their very long wavelengths required a different solution. By mounting the woofer close to the floor, floor reflections remain in phase, reinforcing the woofer's output and preserving its smooth response.
Another benefit of the A200's tall, slim cabinet is the opportunity to mount the midrange and tweeter near ear level to enhance the sonic perspective. Mid and high frequency information emanates at the proper height in space, eliminating the "highs-at-knee-level" phenomenon of typical cabinet shapes.

Specifications:
Drivers:
Low-frequencies  :  10" (250 mm) acoustic suspension woofer
Mid-frequencies :  4-1/2" (120 mm) midrange with ferrofluid
High-frequencies ;  1" (25 mm) soft dome tweeter with ferrofluid
Crossover Frequencies:  450 Hz and 3000 Hz
Sensitivity:  1 watt produces 90 dB at 1 meter
Impedance:  8 Ω nominal
Low Frequency Response "  -3 dB at 36 Hz
Driver Fuses:
Tweeter :  1,5 A
Midrange :  2 A
Dimensions (H x W x D):  1040 x 530 x 160 mm (41" x 21" x 6-3/8")
Weight:  27 kg (58 lbs)

Boston A150 loudspeakers

The new model A150 offers performance similar to our larger, more expensive A200 in a more compact, less expensive enclosure.
The three-way A150 employs a 10-inch acoustic suspension woofer, a 4-1/2" midrange with ferrofluid, and a 1-inch soft dome tweeter with ferrofluid in a 30-1/2" (high) x 16-1/2" (wide) x 8" (deep) cabinet finished in furniture-grade oak veneer.
A 1-1/2-inch black pedestal base is supplied for floor placement.
The tall, slim cabinet together with careful driver placement minimize out of phase reflections from nearby room surfaces (the flor and the wall behind the speaker) for exceptionally smooth response and precise stereo imaging.


Specifications:
Frequency Response:  36 Hz - 25,000 Hz ±3 dB
Crossover Frequencies:  550 Hz and 3000 Hz
Impedance:  8 Ω nominal
Sensitivity:  90 dB at 1 meter with 1 watt input
Dimensions (W x W x D):  32" x 16-1/2" x 8"

NAD 5325 compact disc player


Specifications
Decoding: 16-bit linear two channels
Frequency Response (Nominal):  8 Hz - 20,000 Hz +0,2 dB -2,0 dB
Deemphasis Error:  +0,5 dB -1,0 dB
Out[ut Level at 0 dB:  2 Volts ±0,7 dB
Total Harmonic Distortion (W/20 kHz L.P.F. at 1 kHz, 0 dB):  0,04% (Nominal); 0,07% (Limit)
Signal-to-Noise Ratio (2W/20 kHz L.P.F)):  96 dB (Nominal); 90 dB (Limit)
Channel Separation:  80 dB (Nominal); 70 dB (Limit)
Channel Balance (at 1 kHz, 0 dB):  0,1 dB (Nominal); 1,0 dB (Limit)
Wow and Flutter:  Unmeasurable (Quartz crystal accuracy)
Remote Control :  Yes
Power Requirements: 110 V, 220 V, 240 V AC 50/60 Hz
Power Consumption:   14 W (0,11A )
Dimensions (W x H x D):  420 x  87 x 231 mm (16,54" x 3,43" x 9,09")
Weight:  3 kg (6,6 lb)

NAD 6325 cassette deck


NAD Cassette Deck model 6325 features
Dolby B and C
CAR Circuit Optimizes Recording for Mobile Environment
Play Trim
Full Logic Transport

Specifications
Speed Accuracy:  +1%
Wow and Flutter: 
less than 0,06% (JIS wtd RMS)
less than 0,1% (DIN wtd. Peak)
Frequency Response:  35 Hz - 16 kHz +3 dB (Dolby NR Off)
Harmonic Distortion:  varies with recording level typically less than 0,3% at -10 dB
Total Harmonic Distortion at 0 dB:
Normal Tape :  less than 1,0 %
CrO₂, Metal Tape :  less than 1,5%
Signal-to-Noise Ratio (ref.3% T.H.D. at 333 Hz CC1R/ARM weighting):
Dolby off :  56 dB
Dolby B :  66 dB
Dolby C :  76 dB
Channel Separation:  40 dB at 1 kHz (35 dB broadband)
Erasure:  better than 70 dB at 1 kHz
Input Sensitivity /Impedance:  40 mV/10 k Ω
Maximum Input level:  25 V
Output Level at 0 dB:  500 mV
Output Impedance:  1000 Ω
Power Requirement:  120, 220, 240 V AC 50/60 Hz
Power Consumption:  23W at 120 V AC
Dimensions (W x H x D):  420 x 122 x 270 mm (16,5" x 4,8" x 10,6")
Weight (net):  4,4 kg (9 lb 13 oz)

Mitsubishi DT-10 cassette tape deck

Advanced Features and Superior Performance
The DT-10 offers both excellent basic performance and great ease in use combined with the attractive lines of the whole Mitsubishi Audio Component line0up. Ultralow wow and flutter - only 0,06% WRMS; are ensured by the use of a DC servomotor with large (2-7/8") flywheel, a capstan circular to within a 0,3 µ tolerance, and a high precision drive assembly.
Special circuitry and selected components help to realize the full advantages of Dolby noise reduction. Mitsubishi's own ultralow-noise PNP-type epitaxial transistors are used in the first stage of the recording equalizer amplifier.

Residual tape meter
The DT-10 has a special meter to tell you how much time is left before the tape will end. Often useful during playback, it is an invaluable aid to high quality home recording.

Recording Master Volume Control and Mixing Facilities
Like the DT-30 , the DT-10 has separate level controls for Mic and Line inputs, so that both can be mixed, and a master recording level control for professional-type fade-in and fade-out effects.

Other Features and Functions
Dolby noise-reduction system
Peak-level indicator plus VU meters
Memory rewind function to (000) on the counter.
Timer-controlled recording and playback possible
l-channel Mic input doubles as input for a mono Mic
Output  level control
Two position adjustment of both equalization and bias
Oil-damped gentle cassette-ejection mechanism.

Specifications
Tape Speed:  4,75 cm/sec (1-7/8 ips) ±1%
Wow and Flutter:  0,06% WRMS
Fast Forward/Rewind:  80 sec (C-60 tape)
Signal-to-Noise Ratio (+3 VU, weighted, 400 Hz)
Dolby Out :  56 dB
Dolby In :  64 dB
Erasure Ratio (1 kHz):  70 dB
Crosstalk: 
Between Channels (500 - 6,300 Hz) :  35 dB
Between Tracks (1 kHz) :  65 dB
Total Harmonic Distortion (400 Hz):  1%
Frequency Response:
Normal Tape :  40 - 12,000 Hz ±3 dB
Special Tape :  40 - 15,000 Hz ±3 dB
Sensitivity:
Mic Input :  0,24 mV
Line Input :  80 mV
Bias Frequency:  85 kHz
Dimensions (W x H x D):  425 x 170 x 379 mm (16-3/4" x 6-3/4" x 14-7/8")
Weight:  9,5 kg (21 lbs)

Mitsubishi DT-30 cassette deck

If you are an audio enginneer, you'll get the most out of the new Mitsubishi Dt-30 in a day or two. You get dynamics, fidelity, color and subtlety like you never dreamed of. If, however, you are merely a gifted amateur, it will take longer. Because the DT-30 is somewhat like a race horse. It runs best under a great jockey. It is more sophisticated, more complex, and more challenging than systems costing twice as much. It has, for example, recording head azimuth adjustment, so you can fine tune for optimum performance with any cassette. It has internal standard oscillators, so you can make acurate and minute bias adjustments.
It has a 3-head structure, so that you can monitor what you're recording while you're recording. Although a professional would be accustomed to this level of instrumentation, you may not be.
Just remember this. The DT-30 is only a machine. With time and care and devotion, you can master it. And produce tapes that are as good as any in the world. Consider the features you have on your side.
A dual-capstan transport system that's guaranteed to reduce Wow and Flutter by 30% or more. An automatic spacing-pauser that adds a short blank space between each segment you are recording.
A peak-hold switch that freezes the dB indicaator at its highest level, long enough for you to make adjustments.
We proudly introduce our potent, eager, demanding, sensitive, beautiful DT-30 cassette deck.

Specifications
Motors: 
1 x PLL Servo DC motor
1 x DC Governed motor
Magnetic Heads
Record :  Ferrite head
Playback :  Sendust head
Erase :  ferrite 
Noise Reduction System:  Dolby NR
Tracks: 4-track, 2-channel
Tape Speed:  4,75 cm/sec
Recording System:  AC bias (85 kHz)
Erasing System:  AC erasing (85 kHz)
Playback Equalization
Normal :  3,180 µsec/120 µsec
FeCr and Special :  3,180 µsec/70 µsec
Input Level/Impedance
Mic :  0,3 mV/1,2 k Ω
Line :  100 mV/ 82 k Ω
Output Level/Impedance
Line :  0,44/22 k Ω
Headphones :  90 mV/8 Ω
Wow and Flutter:  0,045% WRMS (±0,09% DIN Wp-p)
Signal-to-Noise Ratio:
Dolby NR out (weighted) :  58 dB RMS
Dolby NR In (weighted) :  66 dB RMS
DIN (weighted) Dolby NR Out :  52 dB
Frequency Response:
Normal :  30 - 17,000 Hz (40 - 15,000 Hz ±3 dB)
FeCr :  30 - 20,000 Hz ( 40 - 18,000 Hz ±3 dB)
Special :  30 - 18,000 Hz (40 - 17,000 Hz ±3 dB)
Total Harmonic Distortion (at 400 Hz, 160 pWb/mm):  1,0 %
Crosstalk
At 1 kHz, between Channels :  35 dB
At 1 kHz, between Tracks :  65 dB
Power Requirements: 110 V Ac, 220 -240 V AC  50/60 Hz
Power Consumption: 28 W
Dimensions (W x H x D):  425 x 170 x 379 mm (16-3/4" x 6-3/4" x 14-7/8")
Weight:  10,5 kg (23 lbs)

Bose Model 601 loudspeakers

A New Direct/Reflecting Speaker of Outstanding performance, High Efficiency, Moderate Cost and Exceptional Versatility
The Model 601 is a totally new Direct/Reflecting loudspeaker fromBose. It employs a unique arrangement of six drivers in each enclosure (four tweeter, two woofers) to achieve a level of tonal accuracy and spatial realism comparable only to the world renownedBose 901 Series III.
These peformance qualities , along with high efficiency, moderate cost, and great versatility of speaker placement in practically any listening environment, make the Model 601 a loudspeaker of exceptional value.
The result is an open, spacious sound and feeling of realism which can not be achieved by conventional speakers with front mounted drivers beaming directly at the listener. Such conventional designs are aimed almost exclusively at producing accurate frequency response, while largely ignoring the spatial qualities so critical to the impact of a live performance. In the Model 601, these important spatial qualities are accurately reproduced through the careful positioning and orientation of all six drivers in each speaker enclosure.

The Concept Behind Bose Direct/Reflecting Speakers
Like the 901 Series III 9the most advanced development of Bose design concepts and state-of-the-art. Manufacturing techniques), the Model 601 is a Direct/Reflecting speaker system . It's designed to reflect the greater part of its sound output off the back and side walls of the room, surrounding the listener with the same kind of balance of reflected and direct sound experienced in a live performance.

The tweeters
Three tweters in each enclosure provide reflected sound, creating a feeling of spaciousness, while one tweeter radiates the smaller proportion of direct sound needed for a strong center image and crisp, sharply defined details.
Two of the tweeters are also positioned to radiate sound upward through the acoustically transparent top grille, thus avoiding interference from furniture in the room.
The Woofers
There are two 8-inch woofers in each Model 601 enclosure, one aimed forward and one angled upward, to contribute an important component of reflected sound. The use of two smaller woofers provides a cone area equal to that of a single much larger driver, while offering importantperformance benefits at low and middle frequencies.
Each high-output woofer is capable of better dispersion and smoother midrange performance than a larger woofer, while they work together to provide bass response of exceptional power and clarity.

Accuracy of Tonal balance
With all four tweeters covering the same upper frequency range and the two woofers covering the same lower range, small response irregularities of individual drivers are averaged and smoothed in a way that can not be duplicated using single drivers.

Efficiency
The Model 601 is also a highly efficient speaker that can deliver superior reproduction of all kinds of music using an amplifier or receiver having as little as 20 watts of power per channel

Technical Information
Spatial Charateristics
Asymetric design for optimum stereo reproduction utilizing rear and side wall reflections. Two woofers, one reflecting, one direct. Four tweeters angled toward the rear walls, side walls, and listening area. Two-Position Symmetry Control; Asymmetric - side directed tweeters receive greater high-frquency excitation than center-directed tweeters; Symmetric - for speaker placement without adjacent reflecting walls, all tweeters are equally excited. Designed in mirror-image pairs for stereo reproduction.
Speaker Configuration
Woofer :  two eight-inch, high-efficiency woofers utilizing long-throw, one-inch voice coils. Linear high-excursion suspension systems providing high output capability
Tweeter :  Four trhee-inch, high-sensitivity, wide-range tweeters
Enclosure :  A walnut veneer floor-standing loudspeaker with ported design and acoustically transparent top
Minimum Recommended Power:  15 watss RMS per channel at 8 Ω
Amplifier rated over 70 watts per channel are unnecessary for "live volume" reproduction.
Amplifiers over 50 watts per channel should be fused
Crossover Frequency:  2 kHz
Impedance:  8 Ω
Dimensions (W x H x D):  15" x 25,5" x 13"
Weight:  36 lbs