My speakers cut out when I turn up the volume too loud. I have a Panasonic CQDFX983U head unit that says it works with 4-8 ohms. I put in some alpine 6x9's in the rear that are rated at 4 ohms. When I fade the sound all the way to the front or to the rear, the speakers don't cut out. I'm trying to figure out what compatible speakers to put in the front.