Best accustic insulation?

[Robh3606]

Yes but even the lighter tiles are at least 3 pcf. You can get those in almost any home center. They are thinner 5/8 so you may have to double them up. But yes the thicker more dense materials will always be better. And your right you need to know what the tiles made out of. As far as better? All I know is I can build a box, drop in the tiles, and have it end up within a 1hz-.5hz of my design spec. tuning frequency.

Rob

[Valentin]

But yes the thicker more dense materials will always be better

not really there are limit and types of materials some absorb some reflect
density is not the only factor

not all ceiling tiles are made of the same materials

JBL uses 1" 3pcf density fiber glass in their encousures at least in the LSR

[readswift]

someone has a link to Mr. Widget's "the next best thing" egg-crate-foam (thats costly)?

[Rusnzha]

Originally posted by Robert Bartsch
Wow; my boxes are 7 cubic feet each - so that would take two bags of this stuff at $35 each.

You would need 7 lbs of the stuff -- They also sell it in 1 or 2 lb quantities. I attached it to the sides and back of the cabinets with silicone glue. I use it in my 12 cubic foot box with a 2241h/720 watt Hypex Amp/Velodyne SMS-1. I spent a bunch on components, why skimp on box treatments. It sounds like a million bucks. You got a lot of replies to check out, I'm sure there are many good ideas. If you can do it for less, thats cool! Good luck.