popping cracking

I just recently started having a problem with my two 6x9's in the back of my Sentra. They started making crazy popping/crackling noises so I unplugged them both from the amp and hooked them back up to the head unit and are no longer popping. I was wondering if that meant for sure my amp was...

I just bought a pair of 6x8 Treo speakers and a pair of interfire tweeters. I installed the speakers my self on Monday(day 1). They were great worked at all volumes etc. The next day i got my tweeters in. I put it all back together and as soon as i got to about 30/40 on my HU i noticed a very...