I got a Kenwood Radio in my car, and i have 2 10' Rockford Fosgates subs. Hooked up too a Coustic D Class amp i believe. And a Capacitor also. Everything works good but when i switch the radio over to cd the amp shuts off and the subs don't work. I don't know why it does that but when it's on tuner everything works. Please help me figure this out.