Dolby SDU4 Surround Decoder Unit

Vintage Dolby Surround Decoder Unit Model SDU4

Dolby DP524 Digital Audio Decoder Rackmount AES/EBU SPDIF Pro Broadcast

Dolby DP562 Multichannel Audio Decoder Professional Rack Mount Unit

Dolby SEU4 Surround Encoder Rack Mount Audio Processor Pro Unit - #C

Dolby DP563 Surround Encoder (Rack Mount)

Dolby SEU4 Surround Rackmount Encoder Unit

Yamaha DDP-1 Digital Sound Processor SURROUND SOUND DECODER Lights Up UnTested!