I put some of this on the floor of my cab today. I think it is a good material for underlayment.
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I also put in some new tunes. First off I got the AM radio working again.
Next I took some powered Boston computer speakers like these that I have not used in years
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they require 12 volt. I cut the power cord and supplied 12 volt from my battery. I ran the supplied port that would normally plug into the computer under the floor mat and into the back of the ashtray. I can plug my phone into that and have a nice sound system that didn't cost me any out of pocket money. To instal I just zip tied the small speakers to the seat bracket and have the bass speaker under the seat facing the front of the truck.