Why am I getting feed back in my subwoofers for about 10 seconds then

On the back of your stereo where your RCA Jack is plugged in, wrap a wire around one of the inputs (either one, doesn't matter which) attach the other end of the wire to any screw on the stereo by slightly loosening it just enough to slide the wire under the screw head and tighten it down. This is a trick normally done when your can hear your engine rpms whine in the stereo speakers butt might help you're issue also. If this doesn't work double check your wiring and make sure your RCA jacks are plugged into 'input' at the amp and plugged into your 'rear output' at the stereo. If nothing then: check your settings on your stereo and make sure that you don't have to turn the sub on thru the deck, i had a JVC CD player that was like that. Good luck.