whitedragon551 5,000+ posts
Moderator
Warranty doesnt cover improper installation which includes blowing products.First off, why did you pay to get those fixed, there are these new things called warrantys. After the second time it blew I would fire your installer and make him pay for speaker replacement/repair since you didn't buy a warranty and still didn't get one after the 2nd blown pair. I'm going to say he's a dirty liar and the amps gain is not properly adjusted, what amp is it? Have you tried turning it down or tuning it personally, it's quite simple and cost less then 5 pairs of speakers. The installer doesn't know whats going on or what he's doing from what it sounds like.
TL;DR = Tune yourself and what type of wire, gauge of wire, and what amp?
Last resort = Aftermarket HU
The issue is the gain is to high or head unit settings are wrong causing clipping/distortion and blowing the speakers.