I purchased this amplifier and was out with it on my second gig when I heard a groveling sound coming from one of the speakers. I had blown one and was only playing at half volume. I decided to get a replacement speaker and received it and replaced the blown one with it. It blew within the next couple of gigs. To make a long story short, I have blown 3 speakers in this amp and have only owned it for 5 months. I have replaced the GK speakers with Eminence speakers and have not had any other problems.