You asked:
Did you use that spray on sound deadener or just dynamat for the rear deck because it get ugly in that area. Were you using a heat gun? When you say I should stuff the rear deck with Thinsulate, what exactly do mean by that? Is that the material they put in pillows? Wouldn't that kill any sound coming from the sub? What's MDF? Sorry about all the questions, but the search option didn't really tell me what I needed to know.
I use dynamat with a heat gun. The spray stuff can be messy but I do like it better than dynamat because it can deaden and stiffen all at the same time. Dynamat only deadens.
Thinsulate is made by DuPont and normally seen in winter gloves, coats and shoes.
Looks like pillow stiffing, but you want high density or pile and the fibers appear to mesh differently, making it a great thermal insulator that happens to be a great sound insulator.
Control how sound gets into the car. I mounted 2 15's behind the rear seat with no noise issues and no sound deadening for 2 years. I won Finals with no sound deadening in the rear of the car. The box and panel sealed off the rear of the car and rear deck, so no noise issues from these areas.
If you mount subs in the trunk firing at the deck lid and/or rear package tray without controlling how the sound gets through, don't be surprised if it rattles. The more power, cone area and X-max, the greater the potential for rattles. Just control how the sound goes through.
Oh, MDF, Medium Density Fiber, Basically it is wood pulp that has been mixed and cured. It's not particleboard but it's the same concept with finer wood (pulp) being pressed into sheets.
