So im trying to help my neighbor with the x2. I havent done any troubleshooting and will start that tomorrow. It has a noise issue with the tower speakers when the rcas arent even plugged into the head unit. So im assuming either the rcas are run to close to a power wire somewhere or theres a problem with the amp. Any thoughts?

Second question. I have the zld and I know all about the ws420. Whats the cheapest fader thats out there? Is it the throttle box? The owner doesnt care so much that he just wants me to mount it where the batteries are because he is confident he will only want to fade once in a while.