Should I use this foam in my OTops?

[miked]

I'm building some OTop12s and have a question about the foam stuffing/lining.
I have a couple of sheets of the foam shown below that should be enough for all 4.

The foam is VERY dense and doesn't compress much at all. I believe it's the stuff you put on your walls to deaden reflections. The stuff is so dense that I worry it will act more as a "spacer" in the cab vs. absorbing reflections. Should I use it, or buy some matress topper?

[Bas Gooiker]

The mattress topper is the cheap and readily available option. This however is designed for exactly the purpose you are going to use it for. So yes, use it.

[miked]

Cool. I was just concerned due to the density of this stuff. This means one less thing to buy! And it's already a much better color than white or Easter-Egg Yellow, like most matress toppers are. Though I'm not sure how great charcoal-gray would look against a black Duratex finish. I could always spray a little flat black on the surfaces you can see through the ports, I guess. Thanks.

[Bruce Weldy]

. I could always spray a little flat black on the surfaces you can see through the ports, I guess. Thanks.

Exactly what I did. Sprayed it right through the port holes. That way, there was no guessing......it shot where you can see.