Not much is known about this model.
The accessory CD-4 demodulator for this series is the DQ-3700.
Stereo Bridge Mode
Joystick Orientation/Balance controls
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 while in Stereo Bridge mode
Two 4 Channel Discrete Tape Monitors
Two Magnetic Phono Inputs (Rear switchable)
4 Channel Discrete Aux input