Mach 460 Please Help??????????
 

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I have a stock 94 gt convert. with the mach460 stereo with an aftermarket panasonic head unit. the head unit has a built in pre-amp. everything worked fine until I blew one of the door woofers. I replaced them with kenwood coaxial 2-way speakers, rated at 4 ohms. Now when the car is running, it seems that the bass amp on the drivers side will cutt out, and when I turn the volume down it will start working again? The strange part is that it only does it when the engine is running? I have also had an intermittent problem when the volume is turned very low I I get a loud humming engine noise through the woofers, my mechanic said it was probably the condesor on the distributor. I don't know if I should change back to the factory speakers, change the head unit, or what???????? Please help, I am very annoyed with the whole situation