I recently installed a pair of Earthquake vtek 693, 6x9 speakers. When i turn up the volume, the tweeters shut down and it sounds like i have a blanket over my head. I know they have a polyswitch, or a cut-off switch to protect them, but these are 700 watt speakers. The should be ablr to handle a lot more than I'm pumping. Does anyone know what the problem is?