Fosgate Audionics Pro-Plus DSL Digital Servo Logic Surround Processor Model One

Vintage Fosgate FOUR Audionics Digital Servo Logic Surround Sound Processor

Fosgate 360° SPACE MATRIX Surround Processor Model DSM-3610 Untested As Is

MCM Custom Audio 50-7772 Phono Preamplifier with 4-Way Input Selector

Fosgate Audionics FAP T 1+ AV Surround Preamplifier Control Amp Processor PREAMP

Fosgate Audionics Model Four Surround Processor

Fosgate Research 3601 Directional Processor Remote

RDL RU-MLA2T Dual Mic/Line Preamplifier with Transformer