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I got a 10" sub installed on my trunk a Rockford R2S-1X10, and I also installed sound deadning, I used Hushmat, but I'm assuming it's similar to your dynamat.
I got it installed inside the doors, underneat the rear seats, underneath the rear speakers (had mine replaced for a larger size). I did not get any installed on the trunk per se.
Granted I had everything installed in 1 go, I don't have any rattles, or any distortion. I don't know if I would have had any if I didn't install it. But so many people recommended I should get it, I did. The folks who did my audio used 10 sheets of hushmat (I don't know if size is the same as dynamat)
I can hear less road noise, the exhaust note is more muted but I can hear it more distinctly. at high rev's it still sounds beautiful.
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