I am hooking it up optically to my JVC 500 watt reciever and listening to it in standard stereo mode (just the two front speakers). It sounds a HELL OF A LOT BETTER than it did with the RCA jacks (no more 60 cycle humm). I can't really compare to how it sounds in my truck because its an entirely different sound system. I also tried out the coax output and it sounds the same to me as the optical, both are excellent. I don't have a way to check the third connector it has.