I replaced my head unit the other day (non-HK) after having issues with it turning on even when the car was off and draining my battery. I bought another stock head unit off eBay, from a guy also on the NAM boards. The replacement install went really easy, but when I was listening to it on my way into work today I get a squealing/static noise from the front speakers, instead of any bass. This sound gets worse the higher the volume. The rear speakers seem to be fine. This happens with both the CD and the radio.

Anyone have any input on this?

Thanks in advance.