2/4 Channel Receiver (1973)
The QRX-4500 is a 240 watt 4-channel receiver endowed with practically all the features necessary for enjoying every type of music in the new, enthralling 4-channel format.
Incorporating the widely acknowledged Sansui QS Regular Matrix system, it features the exclusive QS Vario-Matrix Circuit, which (1) decodes encoded 4-channel program sources back into 4-channel and (2) transforms (synthesises) conventional 2-channel sources into 4-channel.
It also has complete provisions for reproducing discrete 4-channel sources.
Tuning range: FM, MW
Power output: 23W/ch into 8Ω (quadraphonic)
Frequency response: 30Hz to 30kHz
Total harmonic distortion: 0.5%
Damping factor: 30
Input sensitivity: 2.5mV (MM), 150mV (DIN), 150mV (line)
Signal to noise ratio: 60dB (MM), 70dB (line)
Channel separation: 45dB (line)
Output: 150mV (line), 30mV (DIN)
Speaker load impedance: 4Ω to 16Ω
Dimensions: 526 x 171 x 317mm
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