Outbacknomad
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I know most of us are not driving buses, but this is nevertheless an interesting article on noise reduction and frequency.
It is a factor why I upped the thickness of the foam in my car.
Definitely worth a read and take onboard the information if you are really serious about acoustic insulation.
www.megasorber.com
It is a factor why I upped the thickness of the foam in my car.
Definitely worth a read and take onboard the information if you are really serious about acoustic insulation.
Industrial soundproofing
www.megasorber.com