Toshiba SA-504 4-ch receiver

4-channel FM/AM/FM Stereo receiver, features:

BTL circuit (53 W x 2,8 rms, 8 Ω , 0,8%)

ITL-OTL-OCL pure complementary symmetry circuit

MOS FETs FM front end

4-gang linear frequency FM tuning condenser and tuned RF AM section

Built-in condenser cartridge equalizing circuit

Built-in QM and SQ 4-channel matrix decoder

CD-4 4-channel adaptor terminals

Black dial

Natural Walnut cabinet

 

Specifications

FM Tuner Section

Tuning Range :  88 - 108 MHz

Sensitivity: 1,8 µV (IHF)[1,8 µV, S/N=30 dB]

Signal-to-Noise Ratio:  66 dB

Capture Ratio:  1,5 dB

Image Rejection:  60 dB

IF Rejection:  80 dB

Spurious Rejection:  100 dB

AM Suppression:  50 dB (IHF)

Frequency Response:  20 - 15,000 Hz ±1 dB

Harmonic Distortion:

Mono :  0,2% at 400 Hz (100% modulation)

Stereo :  0,5% at 400 Hz (100% modulation)

FM Stereo Separation:  35 dB at 1,000 Hz

19 kHz, 38 kHz Suppression:  50 db

AM Tuner Section

Tuning Range:  530 - 1605 kHz

Sensitivity :  15 µV (IHF)

Signal-to-Noise Ratio:  45 dB

Selectivity :  30 dB (±10 kHz)

Overload :  2 V/m at 1,000 Hz

IF Rejection:  70 dB

Harmonic Distortion :  1 %

Audio Section

Power Output:  30 W x 4 (rms 0,4%, 8 Ω , each channel driven) or 53 W x 2 (at BTL connection, rms 0,4%, 8 Ω , each channel driven)

Frequency Response:  20 - 40,000 Hz 12 dB

Power bandwidth:  10 - 80,000 Hz (IHF, 0,4%)

Signal-to-Noise Ratio

Phono :  65 dB

Aux :  80 dB

Input Sensitivity/Impedance (for rated output):

Phono :  2,5 mV/47 K Ω

CC :  30 mV/70 k Ω

Aux :  160 mV/47 K Ω

Tape :  160 mV/47 K Ω 

Damping Factor:  20 at 8 Ω

Tone Control:  ±10 dB at 100 Hz and/or 10 kHz

High Cut Filter:  6 dB /oct, fc = 9000 Hz

Low Cut Filter:  6 dB/oct, fc = 30 hz

Residual Noise:  1,5 mV or less

Loudness Control:  +10 dB (ay 100 Hz); +4 dB (at 10 kHz)

Total Control

Volume :  4-gang, co-axial

Tone Control : Bass and treble for each Front and Rear channel :  4-gang, co-axial

Balance :  4 (discrete)

Selector :  AM/FM auto/Phono/Aux 1 (4-ch)/ Aux 2 (4-ch)

Mode :  Mono/Stereo/4-ch 1 (QM)/4-ch 2 (SQ)/4-ch 3 (discrete)

Power/ Speaker Switch :  PWR Off/A (4-ch)/SP Off ]/B (2-ch)/A+B

Accessory Switch :  CC/Mag; Tape monitor, FM muting, Loudness, AFC, audio mute; Hi/Lo cut

Antenna

FM :  300/75 Ω  terminals

AM :  Ferrite core antenna, external antenna terminals

Connector :  Aux (4-ch), Phono (Mag/CC), Rec /P.B. (4-ch), 2-AC outlet, Headphone (frontand rear) pre-out/main-in

Accessory Circuit:  Circuit breaker for final stage FM muting, audio muting, signal strength meter, center-zero meter

Semiconductors:  5 ICs; 3 FET, 38 Transistors; 24 Diodes

Power Requirements:  AC 100/120/220/240 V, 50/60 Hz

Cabinet:  Natural walnut

Dimensions (W x H x D):  508 x 125 x 356 mm (20" x 4-7/8" x 14")

Weight:  15 kg (33 lbs)

 

Toshiba SA-304 4-ch receiver

4-channel FM/AM/FM Stereo receiver, features:

BTL circuit (20 W x 2 rms, 8 Ω , 0,8%)

IC power output section

MOS FETs FM front end

Built-in QM 4-channel matrix decoder

CD-4 4-channel adaptor terminals

Black dial

 

Specifications

Tuner Section

Tuning Range

FM :  88 - 108 MHz

AM :  530 - 1605 kHz

Sensitivity:

FM :  2,5 µV (IHF)

AM :  20 µV (IHF)

Signal-to-Noise Ratio

FM :  62 dB

AM :  45 dB

Capture Ratio:  2,5 dB

Image Rejection:

FM :  55 dB

AM :  35 dB

IF Rejection:

FM :  60 dB

AM :  30 dB

AM Suppression (FM):  35 dB

FM-ST Separation:  30 dB at 1000 Hz

Audio Section

Power Output:  10 W x 4 (4-ch), 20 W x 2 (BTL) rms each channel driven , 8 Ω , 0,8%

Frequency Response:  20 - 40,000 Hz ±2 dB

Power bandwidth:  20 - 30,000 Hz (IHF, 0,8%)

Signal-to-Noise Ratio

Phono :  60 dB

Aux :  70 dB

Input Sensitivity/Impedance (for rated output):

Phono :  3,0 mV/200 K Ω

CC :  30 mV/70 k Ω

Aux :  200 mV/100 K Ω

Damping Factor:  26 at 8 Ω

Tone Control:  ±10 dB at 100 Hz and/or 10 kHz

Residual Noise:  0,8 mV

Loudness Control:  +10 dB (ay 100 Hz); +4 dB (at 10 kHz)

Total Control

Volume :  4-gang, co-axial

Bass :  4-gang, co-axial

Treble :  4-gang, co-axial

Balance :  4 (discrete)

Selector :  AM/FM auto/Phono/Aux (4-ch)

Mode :  Mono/Stereo/4-ch 1 (QM)/4-ch 2 (SQ)/4-ch 3 (discrete)

Power/ Speaker Switch :  PWR Off/A (4-ch)/SP Off ]/B (2-ch)

Accessory Switch :  Tape monitor, 4-speaker/BTL, FM mute

Antenna

FM :  300/75 Ω  terminals

AM :  Ferrite core antenna, external antenna terminals

Indicator:  FM-ST indicator; F/AM tuning meter

Semiconductors:  5 ICs; 3 FET, 38 Transistors; 24 Diodes

Power Requirements:  AC 100/120/220/240 V, 50/60 Hz

Cabinet:  metal cabinet

Dimensions (W x H x D):  400 x 125 x 290 mm (15-3/4" x 4-7/8" x 11-3/8")

Weight:  8,2 kg (18 lbs)

 

Noresco System 85524

Our equipment speaks for itself

Noresco a Canadian Company founded nearly seven decades ago. Our business is to make quality quadraphonic and stereo components. And we think we make the best in the business. We say this because of the rigid quality control Noresco components have to pass to get our stamp of approval.

We built our own research and testing facilities in which a team of dedicated engineers create quality products for today's discriminating consumer. We determine beyond a doubt that Noresco equipment will reproduce the truest, richest sound possible. We do all this because when people say :Noresco" we want to hear them say the word "Quality" that's why you'll find our name in the finest stores and in the highest quality audio shops right across Canada.

Quadraphonic High Fidelity from Noresco

Previously, if you wanted to have the exotic feeling of being surrounded by music, a concert hall would be the place to go. Here the sounds come off the stage and reverberate off walls, ceiling and floor and by the time you hear the music it is all beautifully blended.

A good concert hall imparts fullness of tone. You will also have a feeling of intimacy with the orchestra. Reproducing this moving experience of a live performance is what 4-channel sound is all about. It's an even more spectacular improvement on stereo, than stereo was on mono.

As the term "4-channel" suggests, you use four speakers instead of two - two at the front and two at the back. Which adds front-to-back dimensions to the conventional side-to-side sound of stereo. But don't get the idea that you can get 4-channel sound by adding two speakers to an existing stereo setup. The only way to get true 4-channel sound is to buy yourself an amplifier with a built-in decoding system, which distributes the appropriate sound into four different speakers.

A good turntable is a must in a quadraphonic High Fidelity system

With Quadraphonic High Fidelity, precise tonearm tracking is as important as the orchestra being in perfect tune. This is where Noresco Quadraphonic system excel. Because they are built around the very finest turntable you can buy - Dual. But even Dual won't give you concert hall performance without precisely matched components. What we offer you is a perfect harmony. Dual automatic turntables. And the best Noresco tuners, receivers and speakers we have ever made. They.ve been designed and tested under the most modern scientific conditions.

 

This smart new system should win your heart and ears because of the outstanding features and the little price tag.

The 40 watt NRC3-855 Quadrasound receiver-turntable gives you an extremely fine sound of AM/FM programs or recordings. Then there's the remarkable Dual 1214 automatic turntable with dynamically balanced tonearm for precise tracking plus a Shure M75MD magnetic cartridge. The NEC-524 speakers are built with the same reproduction accuracy as Noresco's best Genuine Walnut finish.

 

Toshiba SC-410 4-channel

4-channel QM Decoder/Amplifier S.C.-410

Decodes almost any type of encoded matrix 4-channel discs at four modes of 4-channel effect.

Decodes 4-channel programs from ordinary non-encoded discs into quasi-quadraphonic stereo sound

Built-in IC power amplifier for two sets of rear channel speaker systems

Connectable to any type of stereo amplifier furnishing DIN socket and PIN "pre out/in" jack

 

Specifications

Power Output:  30 W rms, 8 Ω , T.H.D. 0,8% (total)

Frequency Response:  20 - 40,000 Hz (exlude QM section)

Power Bandwidth:  20 - 40,000 Hz (exclude QM section)

Semiconductors: 

2 Transistors for AF amplifier

1 Diode for power Supply

2 ICs (TH-9015P's) for power output section

4 FET's and 4 Transistors for QM decoder

Controls:  Main volume, Sub volume, Selector (2-ch/4-ch/tape/aux), Power Off, Speaker A & B, QM effect (concert hall/studio/surround/stage), Hi-cut

Jack and Terminal:  DIN socket, Input/output jack, AC unswitched outlet, speaker terminal

Power Source:  AC 100/120/220/240 V 50/60 Hz

Dimensions (W x H x D):  300 x 115 x 385 mm (11-3/4" x 4-1/2" x 15")

Weight:  6 kg (13-1/4 lbs)

 

Pioneer QX-8000A 4-channel receiver

To compose an ideal 4-channel stereo system, the QX-8000A, a solid state AM/FM stereo receiver, can be combined with four speaker systems, tape decks, turntables, etc. With a 4-channel stereo tape deck or cartridge tape player installed, the QX-8000A can provide a discrete 4-channel playback of programs recorded on tape.

 

4-Channel Reproduction from Matrix 4-Channel Source

The self-contained matrix circuit permits 4-channel reproduction from matrix 4-channel records or FM stereo broadcasts. The mode switch has positions for regular matrix and SQ matrix reproduction, allowing reproduction to take either of these forms.

 

Matrix Reproduction from 2-Channel Source

A 2-channel signal from a record of FM broadcast can be reproduced in 4-channel form via the regular or SQ matrix circuit. In this case, the result is an improvement over ordinary 2-channel stereo reproduction.

 

2-Channel Stereo Performance

Conventional 2-channel stereo performance can be provided through an arrangement or two speaker systems in the front; Ieft-side speaker system and right-side speaker system. A 2-way multi-amplifier system can be set up by installing an electronic crossover network.

 

Features

 

Acoustical field reproduction from 4-channel stereo

The amplifier section consists of four separate channels having excellent frequency response and very low distortion, providing for 4-channel discrete reproduction of a 4- channel source (recorded tape).

 Choice of matrix decoder

The OX-8000A offers a choice of two decoders; the regular matrix and the SO matrix. The source may be a matrix recording or FM broadcast of a matrix recording. The result is realistic 4-channel reproduction.

 Matrix circuit for ordinary 2-channel stereo

Use of the internal matrix circuit enhances the effect of ordinary 2-channel stereo source material, over and above that normally obtainable.

 Also works as standard 2-channel stereo receiver

lf you only have one pair of speakers now, you can use the OX-8000A as a regular 2-channel stereo receiver and add the other two speakers at a later date.

 Permits 4-Channel or 2-Channel tape recording

lf you already own a 2-channel stereo tape deck, you can go on using it for recording and playback as before. However, if you plan to buy a 4-channel tape recorder, you can use fully the discrete 4-channel capabilities, playing back 4-channel pre-recorded tapes with true 4-channel sound.

 Fully equipped with 4-channel Auxiliary controls and inputs

There are three balance controls: front left-right balance, rear left-right balance, and front-rear balance. These give you complete control over the 4-channel sound field. Also, separate stereo headphones for the front and rear channels are provided important when monitoring 4- channel tape recordings. Other features include "speakers in operation" indicator lamps, program indicator lamps, loudness switch, high and low filter switches, FM muting switch, 300Q and 75O (coaxial) FM antenna terminals, and a 4-position channel mode selector.

 Versatile tape-to-tape duplicating facilities

Normal 2-channel tape-to-tape dubbing is possible too, as well as 4-channel tape-to-tape duplicating.

 FET-equipped FM tuner

The FM tuner is equipped with an FET in its front end to improve selectivity and sensitivity. Also, the lF stage employs one hybrid and one monolithic lC, replacing numerous transistors, ceramic filters, etc., and raising the tuner's sensitivity and selectivity. The FM MPX decoder works according to the time switching system and boasts excellent channel separation. Tuning is made easy by the linear FM dial and the double (signal strength and center zero tuning meters.

 Built-in AM ferrite Bar antenna

Sensitive and highly directional. An outdoor AM antenna is not required in most cases.

 Low-distortion High-Power Audio amplifier

Both tone controls and equalization amplifier operate with a generous amount of negative feedback for improved frequency response accuracy and flatness. The power amplifier is a quasi-complementary design, a tried-and-true circuit construction.

 All new 4-Channel exterior design

Cabinet and control panels are visual symbolizations of the Pioneer "4-channel" concept, with a recessed, framed, square tuning dial, a modernistic and logically arranged control panel, and the famous silver-black-wood Pioneer color styling.

 

Specifications

FM Tuner Section

Frequency Range:  88 MHz to 108 MHz

Usable Sensitivity (l HF):  2,2 µV

Capture Ratio (lHF):  3 dB

Selectivity (lHF):  better than 40 dB

lmage Rejection:  better than50 dB (98 MHz)

lF Rejection:  better than 85 dB (98 MHz)

Spurious Rejection:  better than 80 dB (98 MHz)

AM Suppression:  50 dB

Signal to Noise Ratio:  60 dB

Harmonic Distortion: 

Mono :  less than 0,6% (100% modulation)

Stereo :  less than 0,8% (100% modulation)

Tuning lndicator:  Signal Strength type and Center tuning type

Muting:  Switchable to On/Off

Stereo Separation:  better than 40 dB (1 kHz)

Sub Carrier Suppression:  better than 32 dB

Antenna lnput:  300 Ω  (balanced), 75 Ω  (unbalanced)

De-emphasis switch:  75 µs/50 µs (5 line voltage model except SABS-approved model)

AM Tuner Section

Frequency Range:  525 kHz to 1605 kHz

Usable Sensitivity (lHF):  15 µV

Selectivity (lHF):  better than 25 dB

lmage Rejection:  better than 45 dB (1,000 Hz)

lF Rejection:  better than 30 dB

Signal to Noise Ratio:  better than 50 dB

Antenna:  Built-in ferrite loopstick antenna

Power Amplifier Sections

Music Power Output (lHF):

180 W at 4 Ω 

130 W at 8 Ω 

Continuous Power Output:  43 W / 43 W / 43 W / 43 W (at 4 Ω )

1 kHz each channel driven:  30 W / 30 W / 30 W / 30 W (at 8 Ω )

Continuous Power Output:  36 W + 36 W / 36 W + 36 W (4 Ω )

1 kHz 2-channels driven:  27 W + 27 W / 27 W + 27 W (8 Ω )

Continuous Power Output:  4 x 27 W  (4 Ω )

1 kHz 4-channels driven:  4 x 22 W (8 Ω )

Power Output in the range of 2O Hz to 2O kHz(2-channels driven) :  21 W + 21 W (8 Ω , Harmonic  Distortion less than 1%)

Harmonic Distortion: 

Less than 1% (Continuous Power Output)

Less than 0.05% (8 Ω   14 W + 14 W/14 W + 14 W Power Output)

lntermodulation Distortion:  

Less than 1 % (Continuous Power Output)

Less than 0.1% (8 Ω   14 W + 14 W / 14 W + 14 W Power Output)

Power Bandwidth (lHF):  10 Hz to 100 kHz (8 Ω , Harmonic Distortion less than 1%)

Frequency Response:  5 Hz to 100 kHz, ±3 dB

Input Sensitivity/lmpedance (1 k Hz Continuous Power Output):  400 mV/70 k Ω

Speakers:  4 to 16 Ω

Damping Factor:  35 (8 Ω , 1 kHz)

Preamplifier Section

Output Voltage:  400 mV (rated output)

Harmonic Distortion:  less than 0,5%

Frequency Response:  10 Hz to 40 kHz ±3 dB

Input Sensitivity/lmpedance (1 kHz, for rated output)

Phono 1 Mag :  2 mV / 50 k Ω

Phono 2 Mag :  2 mV / 50 k Ω

Mic :  8 mV / 120 k Ω

Aux 1, 2 :  170 mV / 130 k Ω

Tape Monitor 1, 2 :  170 mV / 130 k Ω

Recording Output: Tape Rec :  170 mV (Pin jack)

BASS Control:  -12 dB, +11 dB at 100 Hz

TREBLE Control:  -8,5 dB ; +10,5 dB at 10 k Hz

LOW Filter:  -6,5 dB at 50 Hz (6 dB/oct)

HIGH Filter:  -11,5 dB at 10 kHz (6 dB/oct)

Equalization Curve:  Phono RIAA standard

Loudness Contour:  +11,5 dB / 100 Hz +7 dB / 10 kHz (Volume -40 dB)

Hum and Noise (lHF Short circuit, A Network): 

Phono :  better than 75 dB

Aux :  better than 90 dB

MISCELLANEOUS

Semiconductors:  3 FETs; 2 ICs; 77 Transistors; 33 Diodes

Power Requirements:  110, 120, 130, 220, and 240 V 50/60 Hz

Power Consumption:  250 W (max)

AC Outlets:  1 x switched, 1 x unswitched

Dimensions (W x H x D):  509 x 172 x 377 mm (20" x 6-3/4" x 15-5/8")

Weight Without package:  15,6 kg (34 lb 5 oz)

With package:  18,6 kg (40 lb 15 oz)

 

Technics SA-8500X

The concept is simple. The execution is precise. The performance is outstanding - the name is Technics.

The SA-8500X - first 4-channel receiver with automatic CD-4 separation.

Until now you had to depend upon your hands, your eyes and your ears to bring you 4-channel sepaation CD-4 records. When they missed, so did you.

With the Technics SA-8500X. Instead of trial and error, the SA-8500X brings you automatic and continuous  CD-4 separation.

The SA-8500X has just about everything else you might want for command of 4-channel. Automatic carrier level controls. A CD-4 dmodulator with LSI IC's for discrete 4-channel records. A decoder for both types of matrix. And an MPX output ready for discrete FM broadcasts.

There's also plenty of power; 26 watts per channel minimum RMS, at 8 ohms from 20 Hz to 20 kHz, at 8 ohms from 20 - 20 kHz with no more than0,5% THD.

But equally important, all this power is under your control. With 4 VU meters  for visual conrtol of 4-channel balance. 3 tape monitors.  Clik-stop tone controls.  High and low filter switches. And a 20 dB audio muting switch for reducing sound oudput without changing the volume setting.

We've also put a 4-pole dual-gate MOS and 3 ceramic  IF filters into the FM section. So you get a sensitivity of 1,9 µV (IHF).

For stereo, a simple flick of a switch on the front panel straps the amplifiers together.  Producing 80 watts per channel, minimum RMS. At 8 ohms from 20 Hz - 20 kHz with no more  than 0,5% THD.

The SA-8500X - it's the way to hear everything in 4-channel the way it should be heard. Because it's the first 4-channel receiver with both automatic carrier level controls and automatic CD-4 separation.

Specifications

Amplifier section

Music Power (IHF):

4-Ch Operation :  260 W at 4 Ω; 180 W at 8 Ω;

2-Ch Operation :  250 W at 8 Ω

Continuous Power (1 kHz RMS):

4-Ch Operation (all channel driven) : 

40 W/40 W/40 W/40 W at 4 Ω

34 W/34 W/ 34 W/34 W at 8 Ω

2-Ch Balanced Transformerless Operation

Both Channels Driven :  85 W/85 W at 8 Ω

Continuous Power (20-20,000 Hz RMS):

4-Ch Operation:

All Channels Driven : 

28 W + 28 W + 28 W + 28 W at 4 Ω

26 W + 26 W + 26 W + 26 W at 8 Ω

2-Ch Balanced Transformerless Operation

Both Channels Driven :  80 W + 80 W at 8 Ω

Total Harmonic Distortion:  0,5%

Intermodulation Distortion (60 Hz : 7 kHz = 4:1, SMPTE) :  0,7%

Power Bandwidth (all ch. driven at 8 Ω):  5 Hz  - 40 kHz -3 dB

Frequency Response:

Phono : RIAA standard curve ±1 dB

Aux :  7 Hz - 70 kHz +0 -3 dB

Residual Hum and Noise: 1,5 mV

Input Sensitivity/Impedance: 

Phono :  2 mV/50 k Ω

Aux :  180 mV/30 k Ω

Playback :  180 mV/30k Ω

Signal-to-Noise Ratio (IHF-A): 

Phono :  70 dB

Aux :  90 dB

Tone Controls:

Bass :  50 Hz ±11 dB

Treble:  10 kHz +10 dB - 10
 Loudness control (Volume at -30 dB):  50 Hz +10 dB

Filters:

Low :  200 Hz, -6 dB

High :  7 kHz,   -6 dB/oct

Audio Muting:  -20 dB

Rec Out:  180 mV

Damping Factor:  10 at 4 Ω ; 20 at 8 Ω

Load Impedance:

Main or Remote :  4 - 16 Ω

Main + Remote : 8 - 16 Ω

FM Tuner Section

Frequency Range:  88 - 108 MHz

FM Sensitivity (IHF):  1,9 µV

Alternate Channel Selectivity:  66 dB

Harmonic Distortion [mono/stereo]:  0,3%/0,4%

Signal-to-Noise ratio:  65 dB

Frequency Response:  20 Hz - 13 kHz ±1 dB

Image Rejection (at 98 MHz):  55 dB

IF Rejection (at 98 MHz):  60 dB

Spurious Resposne Rejection (at 98 MHz):  60 dB

Capture Ratio:  1,5 dB

Am Suppression :  50 dB

Stereo Separation (at 1 kHz):  40 dB

Leak Carrier (19 kHz, 38 kHz)

Am Tuner Section:  frequency Range :  520 - 1610 kHz

Sensitivity:  20 µV

Selectivity:  25 dB

Image Rejection ( at 1000 kHz) :  40 dB

IF Rejection (at 10000 KHz) :  40 dB

General:

Power Supply:  110 - 120 V, 220-240 V AC, 50/60 Hz

Power Consumption:  360 W

Dimensions (W x H x D):  21-11/32" x 6-3/32" x 15-9/16"

Weight:  37,3 lb

Pioneer QX-4000

 A new four-channel stereo receiver capable of decoding all kind of matrixed program sources into a living presence sound field.

A tremendous 4-channel receiver value, the QX-4000 features a liner type FM dial scale, an extra-large signal meters for precise FM tuning, and is equipped with Pioneer's Matrix Decoding circuitry for capability of decoding any kind of matrix 4-channel program sources, including the QS sources. Output power of up to 108 watts is more than enough to fill a conventional sized listening room with full-bodied distortio-free sound. The unit can also be used asa conventional 2-channel receiver, in addition to discrete 4-channel reproduction.

 You thought the excitementof four-channel sound was beyond your budget? Think again. With the new QX-4000, Pioneer is happy to introduce economically-priced 4-channel to the merketplace. But it's not the kind of 4-channel receiver that performs of looks inexpensive. To the contrary, the QX-4000 offers all the important performance features of Pionner's larger, more expensive receivers. Things like sensitive AM/FM reception. Two kinds of matrix decoders for reproduction of all the important matrix encoded sound sources available today, including popular SQ sound. A linear type FM dial scale and extra-large signal strength meter for precise tuning. And power, too, up to 10 watts x 4 at 8 ohms with all four channels driven simultaneously. So if you don't think you can afford 4-channel today. Pioneer asks you to stop and consider the QX-4000, authentic four-channel sound on a two channel budget.

Specifications

FM Usable Sensitivity(IHF):  2,2 µV

FM Selectivity (IHF):  more than 40 dB

Music Power (IHF):  108 watts at 4 Ω; 80 watts at 8 Ω

Continuous Power at 4-CH Driven:  10 watts x 4 at 8 Ω

Harmonic Distortion:  less than 1%

Power Bandwidth (IHF):  15 to 20,000 Hz (8 Ω, 4-Ch driven, less than 1% THD)

Dimensions (W x H x D):  17-3/4" x 5-11/16" x 13-3/4"

Weight:  22 lb, 4 oz

Kenwood KA-3344

 The rich, treasure-laden sound of 4-channel stereo is a listening treat you should not miss. Kenwood's KA-3344 multi-purpose amplifier makes 4-channel reproduction all yours in an easy-to-operate instrument. That's beacuse the KA-3344 is especially-designed to reproduce all 4-channel sources-discrete type,matrix type and quasi-4-channel program sources. Rear channel speaker systems are driven by the stereo main-amplifier. Still another receiver or pre-main amplifier controls front channel speaker systems. Built-in encoder circuitry helps to reprint matrix 4-channel tape from discrete 4-channel tape. Booming, ultra-sensitive 4-channel effects are then reproduced through Kenwood-sophisticated decoder circuitry. Throughout, the ultimate in all-purpose amplifier uses.

 Special Features

4-Channel Reproduction

The KA-3344 includes the newly developed Kenwood method 4-channel matrix circuitry and stereo main amplifier. By adding KA-3344 and a pair of speaker system for rear channel to the ordinary stereo system, the surround sonic 4-channel reproduction is perfectly enjoyable from all kinds of program sources - the encorded 2-channel sources, the ordinary 2-channel sources and of course discrete type 4-channel sources.

2-Channel Tape from 4-Channel Tape

The built-in encorder circuitry enables to reprint matrix 4-channel (usable as an ordinary 2-channel too) tape from discrete type 4-channel tape. It can be reproduced with satisfactory 4-channel effect through KA-3344's decorder circuitry.

Sound Illumination

By the exclusive Color Sound System, the sound performance can be monitored and enjoyed through the illuminating color varieties. The whole frequency range is electronically divided into 3 parts and is lighted colorfully. The suitable operating point can be settled by the Level Control attached, and can be cancelled when it is unnecessary.

Specifications

Dynamic Power Output (IHF):

30 W at 4 ohms

26 W at 8 ohms

Continuous Power Output (each channel driven):

11 W - 11 W at 4 ohms

10 W - 10 W at 8 ohms

Harmonic Distortion:

At rated output :   less than 0,8%

At -3 dB rated output :  less than 0,2%

Intermodulation Distortion:  less than 0,8% at rated output

Frequency Response:

(IDS) : fo - 30 kHz ±2 dB

4 CH :  25 - 30 kHz ±2 dB

Power Bandwidth:  40 - 20 kHz ±2 dB

Input Sensitivity (for rated output):  100 mV

Low Output (IDS):  80 mV

Recording Output:  100 mV

Hum and Noise:  less than 1 mV

Damping Factor:  50 at 8 Ω

Speaker Impedance:  4 to 16 Ω

Bass Control:  +_8 dB at 100 Hz

Treble Control:  ±8 dB at 10 kHz

Loudness Control (at -30 dB):  8 dB ±3 dB at 100 Hz

Crossover Frequency:  400; 800; 5,000 Hz

Power requirement:  110/117 V, 220/240 V, 50/60 Hz

Power Consumption:  80 W (at full power)

Dimensions (W x H x D):  16 ¼" x 4 ¾" 12"

Weight:  16,5 lbs

Akai AS-1080 DB

 4-Channel Stereo Receiver

4-channel Dolby recording and payback  with an ordinary tape deck for first time in audio history. This is only one of the many outstanding features of the new AS-1080 DB. This new 4/2 channel compatible receiver incorporates all the latest engineering techniques and offers performance quality to match anything on the market todey. Yet the cost of this deluxe model is far below what you would expect to pay for such quality. Robust 3mm thick aluminium front panel. Easy-to-operate precise controls. Designed for efficient operation of present and future audio capability.

 All-Stage Direct Coupled OCL Pure Complementary Power Amplifier

40 watts per channel continous power output (80 watts per channel at 2-Ch power Doubler), minimum RMS at 8 ohms load impedance with no more than 0,2% distortion. These outstanding specifications are the result of employing an all-stage direct-coupled OCL pure complementary 4 Power IC circuit in the all important power section.

Power Transistor Protection Circuit

A protection circuit is activated in case of a short caused by a wrong speaker connection or when input is excessive to protect the power transistors. Further, this circuit cancels the irritating speaker shock noise when the power switch is turned On or Off

Varied 4-channel operation includes Dolby 4-channel performance (a first in the field of audio)

This 4-channel / 2-channel compatible unit, in addition to regular and discrete stereo, SQ Full Logic and Matrix 4-channel stereo, and CD-4 capability, also features 4-channel Dolby recording and playback with an ordinary 4-CH tape deck.

SQ Full Logic Decoder Circuit

The SQ Full Logic decoder of this model is a superior Front/Back Logic wave matching circuit employing a 6-pole phase shifter for excellent front and rear channel separation.  3 advanced large scale Sony ICs.  SQ Indicator lamp.

Matrix Decoder Circuit

Facilitates playback of matrix encoded phonograph records.

 CD-4 Demodulator Circuit and Separation Adjust

A built-in CD-4 demodulator circuit and CD-4 Separation Adjusters facilitate easy playback of CD-4 records. Front panel CD-4 indicator Lamp. CD-4 test record included in standard accessories.

Four separate Dolby Circuits

A separate Dolby Circuit for each channel enables 4-channel Dolby Recording and Playback with an ordinary 4-channel tape recorder or tape deck for the first time in audio history.

Dolby Operation

The Dolby System of this model facilitates recording and playback with an ordinary 4-channel tape recorder or tape deck. Precise Dolby Controls, a Dolby Level Meter Switch, and Dolby Level Adjustment Tape (included in the standard accessories) enable easy and precise Dolby System level adjustment, 40channel or 2-channel Dolby recording and playback, 4-channel or 2-channel Dolby Dubbing (Dolby recording from ordinary tape playback)from Tape 1 to Tape 2 System, and Dolby FM broadcast reception are among the outstanding Dolby capabilities of this model.

Two compelete 4-channel Tape Deck Connections for varied recording and Dubbing techniques.

Multiple Source Selector, Tape Monitor, and Mode Switch positions and two complete tape systems for a plethora of 2-channel or 4-channel recording and dubbing techniques. Use Tape 1 and tape 2 systems separately or simultaneously. Easy dubbing to and from Tape1 and tape 2 Systems. Also equipped with two complete 4-channel speaker connections.

Two Channel Power Doubler

Setting the Speaker Switch to 2-Ch Power Doubler switches the amplifiers to BTL for all available power in 2-channel mode. Further, transition is smoothe with no irritating speaker noise.

Up-to-Date High Efficiency IC Circuitry in FM IF Section

This totally new up-to-date element is comprised of a 6-stage limiter circuit, a detection circuit, and several auxiliary circuits and does the work of 213 separate parts using parts available to date. Namely, it would require 100 transistors, 84 resistors, 25 dides and 4 condensers to accomplish the same thing. Further, because the detection circuit employs "Quadrature" detection, excellent linearity and low distortion is attained over an exceptionally wide frequency range.

PLL  MPX Section for Good Separation and Low Distortion

This model features the new PLL (Phase Lock Loop) circuit which locks the 19 kHz FM pilot signal phase to the phase of the 38 kHz switching signal for complete stability. Separation better than 40 dB. Less than 0,4% THD.

Automatic FM Center Tuning and FM Mute Switch

Perfect center tuning is always attained. With AFC (Automatic Frequency Control), it is not necessary to tune to exact FM center frequency. Simply bring the needle within the FM center scale of the meter and perfect center tuning is automatically of fluctuation in power supply voltage or temperature. An FM Mute Switch enables the operator to effectively cut noise originating prior to antenna input.

Large Balanced Flywheel Tuning

Large balanced flywheel tuning and superior FM and Am circuitry provides smooth and easy "power steering" tuning and top FM and Am reception.

Loudness Circuit for Balanced Sound at Low Volume

Boosts bass and treble response for balanced sound at low volume

High and Low Filter Switches

Eliminates high and low frequency disturbances for clearer playback

4-Channel Remote Control Balance

A rear panel Remote Control Jack accomodates AKAI optional accessory Remote Control Unit RC-4CH for remote control of front/rear and left/right speaker balance and volume

FM 4-CH Output Terminal

Equipped with rear panel FM 4-channel output terminal for connection of an adapter for future FM 4-CH broadcast reception.

 Other Features

Two full speaker systems feature easy push button connectionn.

300 Ω and 75 Ω antenna terminals with distance/local switch plus AM bar antenna.

Separate front and rear channel Bass and Treble controls for perfect tone control.

Front and rear channel headphone jacks.

Specifictions

Amplifier Section

Continuous Power Output 4-channels driven:

40 watts per channel, min. RMS, at 8 Ω from 20 to 20,000 Hz, with no more than 0,2% THD

4 x 50 watts into 8 Ω at 1 kHz with no more than 0,2% THD

Continuous Power Output 2-channel driven (Power Doubler ON):

80 watts per channel,min.RMS at 8 Ω from 20 to 20,000 Hz, with no more than 0,2% THD

2 x 100 watts into 8 Ω at 1 kHz with no more than 0,2% THD

Power Bandwidth (IHF):  10 Hz to 60,000 Hz / 8 Ω (distortion within 0,2%)

Input Sensitivity:

Phono : 3 mV/ 47 k Ω (CD-4 1,5 mV/ 47 k Ω)

AUX : 160 mV/47 k Ω

Tape 1 & 2 : 160 mV/47 k Ω

Signal-to-Noise Ratio (IHF): 

Phono : Better than 80 dB

AUX : Better than 90 dB

Channel Separation (IHF):

Phono :  Better than 50 dB (at 1kHz)

Equalizer: RIAA Standard ± 1 dB (Phono)

Tone Control

Bass : ±10 dB at 100 Hz

Treble : ±10 dB at 10 kHz

Loudness Control:  +9 dB at 100 Hz,  +4 dB at 10 kHz (Volume Control at -30 dB position)

Filter: 

High : -6 dB at 10 kHz

Low : -10 dB at 50 Hz

Dolby System:  Dolby "B" processor

Dolby Tone:  400 Hz / Rec. Out, PIN 150 mV

FM Tuner Section

Frequency Range:  88 MHz to 108 MHz

Sensitivity (IHF):  1,9 µV

Capture Ratio (IHF):  1.0 dB

Selectivity (IHF):  Better than 70 dB at 98 MHz

Signal-to-Noise Ratio:  Better than 70 dB

Image Rejection:  better than 75 dB at 98 MHz

IF Rejection:  Better than 90 dB at 98 MHz

Spurious Rejection:  better tham 80 dB at 98 MHz

Harmonic Distortion

Monaural : less than 0,2%

Stereo : less than 0,4%

FM Stereo Separation:  Better than 40 dB (1kHz)

FM Muting:  Variable (3 to 300 µV) ON - OFF

Antenna Input Impedance: 

Balanced : 300 Ω

Unbalanced : 75 Ω

AM Tuner Section

Frequency Range:  535 kHz to 1,605 kHz

Sensitivity (IHF): 

200 µV/m (Bar antenna)

5 µV (External antenna)

Image Rejection:  Better than 55 dB at 1,000 kHz

IF Rejection:  Better than 45 dB at 1,000 kHz

Selectivity (IHF):  better than 30 dB at 1,000 kHz

AM Distortion:  Less than 0,6%

Signal-to-Noise ratio:  Better than 50 dB

General Section

Semiconductors:  1 FET, 90 Transistors, 68 Diodes, 18 ICs

Power Requirement:  110 - 120 V, 220 - 240 V (Switchable) 50/60 Hz

Dimensions (W x H x D):  520 x 182 x 409 mm  (20,5" x 7,2" x 16,1")

Weight:  19,3 kg (42,5 lbs)