Alright over the weekend I bought a pair of 3 way a-series pioneer speakers from walmart for 50 bucks. I put them in my front doors and they work great and sound better. Here's the problem though, i left my rear speakers stock and now the back left speaker buzzes and cracks after i turn my stereo up past 30 volume. I have a pioneer DEH-5000UB head unit if that helps at all.

 

could be blown

 

well i fixed it. silly me taped the 2 speaker wires together on the driver door, re taped them and all better!