Ok, so I'm running audio out of my Dish Network box via 50' of RCA, down through the basement, and back up through the wall into my den, which is going through a wall plate, that then jumpers via a 3' RCA cable into a stereo's Aux in. This stereo is hooked up to a 6 zone speaker switch box, so I can have audio in multiple locations in the house. Reason? I get Sirius music free from DishNet
Now, the audio coming from the DishNet box is awfully quiet. So I bought a small GE stereo pre-amp. RCA in, RCA out, powered by a 9V battery (brand new and reads 9.0V on a multimeter). Simple right? Well, when I put it in the chain (doesn't matter if its by the DishNet box before going through the basement, or in the Den after coming out of the wall), it seems to overdrive the signal very much, and its all garbled and crackly.
Now, the only other thing worth mentioning, is that without the pre-amp at all, if I disconnect one of the 2 RCA leads (i.e. L or R), the volume jumps up louder. But when both are plugged in, the volume drops low drastically. Is this possibly a grounding issue??
It could be a couple of things. First, 50 feet is a LONG run for a signal. Even through good-quality RCA cables. Any noise that they pick up is obviously going to be amplified by the line amp.
The line amplifier could also be of poor quality.
Have you tried shorter cable runs to see if it's the cable or the pre?