Dynamat sound insulators

Havent yet decided how soon i want to purchase but i was curious if anyone knew how to install dynamat sound insulators on my front doord and rear window dash for my 92 gl sedan? i was told by someone at best buy that would make a big differance in my sound and system performance. thanx

I went to a carpet store and bought enough new jute padding to line the whole inside of the car for less than $10. Get some adhesive and can glue it anyplace you think it will do some good.