I can't seem to find any detailed information regarding the empegs RCA outputs. I remember someone saying it had a 4V output signal but I need details like the ohm and kili-ohms.

I was speaking with a service person at an alpine dealer and explained my 'cassette hiss' between the empeg & alpine and he wanted to know what these values were. He said it's possible that these two devices don't "like" each other.