SANSUI QRX-2000

Commentary

A 4-channel receiver with a newly developed QS Barrio matrix circuit.

Equipped with QS Barrio matrix circuit developed by SANSUI.
This circuit applies an acoustic-psychological phenomenon called directional masking. When strong and weak sound simultaneously reach the ear, the direction of the weak sound is masked and becomes unclear. This phenomenon is electronically incorporated into a 4-channel circuit.
Compared to conventional 3-dB-type RM decoders, this method provides theoretically infinite channel separation, so the QRX2000 is set to the most desirable value for music playback. It also provides more accurate localization and better sound quality than conventional RM decoders.

Equipped with a function switch that can select various 4-channel effects.
If you press the QS Synthesizer switch, you can enjoy two channel records and other four channels with the new QS Synthesizer function.
The QS Regular Matrix combines the traditional RM with the Barrio Matrix to provide high quality QS4 channel playback.
The phase matrix uses a unique QS Barrio matrix circuit to provide good separation for SQ playback.
Discrete devices support playback of 4-channel tape decks and CD-4-demodulators.

All stages are directly connected to the semi-power complimentary service circuit for the power amplifier.
In the QRX 2000, attention is paid to the heat dissipation effect of the power transistor, and each channel stage is unitized and mounted on the motherboard.

The front-end of the FM tuner section uses a dual-gate MOS FET and a precision 3-row varicon for higher sensitivity. The IF stage uses four ceramic filters and the MPX section uses a dedicated IC for stable sound quality.

The power supply section is equipped with a power transformer of one rank higher class, the power capacitor is equipped with a ripple filter at 4,700 μ F, and a stabilized power supply circuit is used to improve the SN ratio and stability.

It is equipped with functions such as tone control, loudness and tape monitor.

Model Rating

Type	4-channel receiver
Synthesizer Unit
Synthesizer section	Synthesizer / decoder Sansui QS Regular Matrix Circuit
Amplifier Unit
Music Power (IHF)	80W (4 Ω, 1 kHz)
Effective power	12Wx4 (8 Ω, 1 kHz, each channel operation) 7 + 7 + 7 + 7W (8 Ω, 1 kHz, 4-channel simultaneous operation)
Total harmonic distortion factor (rated output)	Not more than 0.8%
Cross modulation distortion factor (rated output)	Not more than 0.8%
Power Band With (IHF)	25 Hz to 30 kHz
Damping factor	20 (8 Ω)
Input Sensitivity / Impedance	Phono : 3mV/50k Ω Aux (4 ch) : 170mV/50k Ω Tape mon (Pin : 2ch/4ch, Din : 2 ch) : 170mV/50k Ω
Recorded output	Tape rec(Pin:2ch/4ch):170mV (Din:2ch):30mV
Frequency Response (Output 1W)	30 Hz to 30 kHz ± 1.5 dB
Hum and noise (IHF)	Phono : 70 dB or more Aux : 80 dB or more
Tone control	Bass : ± 10 dB (50 Hz) Treble : ± 10 dB (15 kHz)
Loudness	+ 8 dB at 50 Hz, + 3 dB at 10 kHz
FM Tuner Section
Sensitivity (IHF)	2.5 μ V
Signal-to-noise ratio	Mono : 60 dB or more
Capture Ratio (IHF)	2.5 dB or less
Image rejection	50 dB or More (83 MHz)
IF Rejection	60 dB or More (83 MHz)
Spurious response rejection	60 dB or More (83 MHz)
Selectivity	50 dB or more
Total harmonic distortion factor	Mono : 0.5% or less Stereo : 0.8% or less
Stereo separation	35 dB or More (1 kHz)
<AM Tuner Section>
Sensitivity (bar antenna)	50dB/m(1MHz)
Selectivity	25 dB or more
Image rejection	80dB/m(1MHz)
IF Rejection	80dB/m(1MHz)
<General>
Rated power consumption	80W (160 VA max)
External dimensions	Width 460x Height 140x Depth 329 mm
Weight	9.0kg