Works great, bought a few of these and installed in my car in the doors and top to bottom in the trunk where my single 12" sub is. And what a difference it makes. My small system is much better sounding, and the increased bass response is incredible. Is it the best product of its kind, maybe not. But Is it totally worth the money, yes. I have used the much more expensive dynamat in a previous vehicle and this stuff is just as good, not to mention it costs a lot less.
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