yes i had already found that one...building a box like that i think is outside the scope of my expertise. I'm not very experienced with car stereos, don't know about ground loop isolators or really hacking into the system like he's done. other people in the thread tried it without success, and before i consider something like that, i'd like to be able to use something that seems to have been designed for it. one thing i can't figure out is, where would the sven4 get power to up the voltage from 4v to 6v? or is it possible to do that without any external power?

also, why does the empeg not show 4v coming out of each rca output?