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Sansui QS-800A

4-Channel Decoder / 2 Channel Rear Amplifier (1973)

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Sansui QS-800A


The QS-800A is a combination of Sansui's new QS matrix system 4-channel decoder and a high performance 200 watt stereo amplifier to amplify the rear channel signals for 4-channel sound reproduction.

The decoder features the exclusive QS Vario-Matrix circuitry which provides optimum separation among the reproduced sounds.

When added to a present stereo system, this decoder and the rear channel amplifier will work together to (1) decode encoded 4-channel program sources back into 4-channel, and (2) transform (synthesize) conventional 2-channel sources into 4-channel.

The QS-800A as a whole also offers complete provisions for reproducing discrete 4-channel program sources and for reproducing 2-channel sources in 2-channel stereo if you so desire.

As such, it is the most complete, most authentic means of upgrading your stereo system to immediate 4-channel status.


Power output: 45W/ch into 8Ω (stereo)

Frequency response: 20Hz to 30kHz

Total harmonic distortion: 0.5%

Damping factor: 200

Input sensitivity: 150mV (line)

Signal to noise ratio: 80dB (line)

Output: 150mV (line), 30mV (DIN), 0.8V (Pre out)

Speaker load impedance: 4Ω to 16Ω

Semiconductors: 61 x transistors, 2 x FET, 39 x diodes, 1 x zener diode

Dimensions: 147 x 462 x 335mm

Weight: 15.5kg


operating/service manual   English -

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