Yamaha DDP-1 AC-3 Decoder/Demodulator.  This unit does one thing: converts RF AC-3 (from a laserdisc player) or digital coax/optical AC3 to 6 discrete analog outputs.

Unit is in used condition with scrapes and bumps and a small dent in the top panel.  Ugly, but functions perfectly.

Please be sure your receiver/amp has RCA 6-channel analog inputs.  This unit will not output over coax or toslink, only input.