Audio Database

Commentary

A 4-channel rear amplifier that incorporates a main amplifier for the rear in a Sansui QS synthesizer decoder.

By connecting to an amplifier with a tape monitor switch, you can enjoy 4-channel playback.

The function switch allows you to select the sound field effect according to your preference, as well as the recording method of the source, the number of songs and the composition.

It is equipped with a phase modulation circuit, and from the rear, phase difference signals (indirect sound and reverberation components) that are transmitted in the hall changing from moment to moment are reproduced. By combining it with the sound from the front, a sound field like that of a concert hall can be reproduced.

In order to obtain a natural sound field, an IC-based pure electronic circuit system is adopted.

The rear amplifier uses the quasi complimentary service ITL-OTL system.

It is equipped with a protective circuit using a quick disconnect fuse.

The rear speaker can be arranged in two ways (2-2 system, 2-2 system in front) depending on the number of songs and composition.
Two methods can be compared by switching the switch.

Model Rating
4-channel rear amplifier
<Synthesizer / decoder unit>
Input Sensitivity / Impedance Rated input : 200mV/50k Ω (2 ch)
Minimum Input : 100 mV (2 ch)
4-channel input : 775mV/50k Ω
Tape Monitor Input : 200mV/50k Ω (Pin/Din)
Output level (front) Rated output : 775 mV
Maximum output : 2.5 V
Recording Output (2 ch) Tape Rec(Pin):200mV
Tape Recorder(Din):30mV
Frequency characteristic Front : 20 Hz to 20 kHz ± 1 dB
Rear : 20 Hz to 20 kHz ± 1 dB
Rear channel phase modulation Maximum 180 ° (10 kHz)
Hum and noise (IHF) 70 dB or more
Main Amplifier Section
Music Power (IHF) 50W (4 Ω)
44W (8 Ω)
Effective power 18W/18W (4 Ω)
15W/15W (8 Ω)
Total harmonic distortion factor Not more than 0.8%
Cross modulation distortion factor Not more than 1%
Power Band With (IHF) 25 Hz to 40 kHz
Frequency characteristic 20 Hz to 50 kHz ± 1 dB
Channel separation 50 dB or More (1 kHz)
Hum and noise 80 dB or more
Load impedance 4 Ω ~ 16 Ω
Damping factor 70 (8 Ω)
<General>
Semiconductor used Transistor : 23
FET : 2
IC : 3
Diode : 10 pcs
Module : 5
Power supply voltage 100 VAC, 50Hz/60Hz
Power consumption 85W (max)
External dimensions Width 250x Height 127x Depth 278 mm
Weight 5.1kg