Yes I get sound out from both RCA (1V) at home,
and front/rear RCA (4V) in car. There is no remote out from the old HU, and no remote out connector on the monsooon cable/system. The mosoon amp is expecting speaker level (12v) input, but the output from empeg is only 4V. I think that's the reason why the amp is not powered up? it might be waiting for 12v speaker level input before turning on the circuit.