This is true that just by backing an enclosure that a sub is firing on, that you will not get a 5db gain or anything like that. My 5db example I referenced was overall improvement at the dash in a sound competition and as I said, "like crazy". This wasn't just throwing a sheet of dynamat in the sub enclosure. It was putting spending days of time and over $1,000 retail in materials to do so. I put undercoating, dynamat, more undercoating throughout the car, on the floors, roof, doors, side panels, etc. In the cavities that could be, they were filled with expanding foam to make everything as solid as could be. The trunk lid itself more than doubled in weight due to all the sound deadening, the entire weight of the car gained around 100lbs from everything that was done for sound deadening. It is not a typical example by any means. I was just trying to illustrate the benefits it can have.
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