I have Diamond 400s speakers on my front doors. For the third time I have lost my left front speaker. The first time it went out it took 3 weeks to get a warranty replacement and that lasted two days before it blew again. They sent back the speaker and the crossover which took 6 weeks to get back. That lasted two weeks and it has gone out again. The install shop where I have been going has gone out of business (Friday was their last day) so now I have to find another shop. My question is, what could be causing the speaker to keep blowing? I have also had to replace the sub recently. I never go above 0db and usually listen to it quieter than that.