The RQ-3747 a is step below the top of the line model however it is still impressive in it's own right.
The accessory CD-4 demodulator for this series is the DQ-3700.
Stereo Bridge Mode
Dimable tuner lights (High/Low)
4 Channel modes supported internally include Discrete, SQ Matrix, and SQ Blend
Supports two sets of four speakers while in 4 Channel mode or two sets of two speakers while in Stereo Bridge mode
Two 4 Channel Discrete Tape Monitors
Two Magnetic Phono Input (Rear Switchable)
4 Channel Discrete Aux input