Sansui QS-10
A 4-channel rear amplifier that uses Sansui's proprietary QS matrix decoding to expand stereo sources into quadraphonic sound, with adjustable speaker configuration.
Overview
The Sansui QS-10 is a 4-channel rear amplifier built to work with Sansui's QS (Quadraphonic Synthesizer) matrix system. It lets you play quadraphonic sound from standard stereo sources. Sansui Electric Co., Ltd. made it as a rear channel processor and amplifier. It pairs with a main stereo amplifier to complete a 4-speaker setup. The synthesizer/decoder section uses a custom-developed IC. A function switch selects between two rear speaker arrangements - the 2-2 system and the front 2-2 system.
Specifications
| Product type | 4-channel rear amplifier |
| Demodulation system | Sansui QS Matrix |
| Rated input | 230mV/50k Ω |
| Tape monitor | 2 ch : 230mV/50k Ω |
| 4 ch (Aux) | 140mV/50k Ω |
| Recorded output | 2ch:230mV(0dB) |
| Rated output (front) | 2ch:160mV 4ch:230mV |
| Phase shift | Left : -90 degrees (300 Hz) Right : + 90 ° (600 Hz) |
| Music Power (IHF) | 20W (8 Ω) |
| Effective power | 6W/6W (8 Ω) |
| Distortion factor | 1.5% |
| Frequency characteristic | 20 Hz to 40 kHz -3dB |
| Load impedance | 4 Ω ~ 16 Ω |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 35W (max) |
| External dimensions | Width 282 x Height 105 x Depth 202 mm |
| Weight | 3.9kg |
Design
The QS-10 puts a Sansui QS synthesizer/decoder section and a rear main amplifier in one unit. The circuit is pure electronic, centered on an IC that Sansui originally developed. Front and rear volume levels are set with slide-type controls. The function switch selects the speaker configuration to match the source material and recording method. The stereo main amplifier uses silicon transistors, which keeps amplification stable for the rear channels.
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