jbeemon

I believe you have connected the wrong turn-on wire to the amp. There are two "turn-on" wires, one for the amp, and one for the automatic radio antenna. When you are listening to the radio, the amps are turned on, because the antenna "turn-on" wire is powered up to cause the antenna to extend. When you switch to something else, like the USB, the antenna wire turns off and thus, so do your amps. Either connect the amp turn-on wire correctly, or go into the setup menu (I don't remember where right now, I'm away from my car or the manual) and change the antenna wire to be powered up all the t

This is really frustrating to me. Before I purchased my F700, I checked this out on a demo unit at a local store. If you begin playing an mp3 on an SD card, and then switch to another audio source, and then switch back to the SD card, it will resume playing where you left off. I had no way to kill the power to the demo unit, so I assumed it would resume play the same way if you turned off the car. Not so! I really hope there is a fix for this someway. Jim

Sounds like you hooked your amps up to the sub woofer RCAs on the back of the unit. Jim