Bass Trap Help

[echopark]

I want to buy Bass Traps like the ones I found on the Ethan Winer Website. The frontside is Plywood , The frame is made with pine,
Installed on the existing wall.
The only difference is, I want to make Modules , to hang it where I want.
Which material and how thick should I take for the back side of the trap that it works fine.

Thanks

Reinhard

[John Sayers]

Hi Reinhard - just line the back with some thin plywood. All it need do is seal the unit.

If you go here http://www.bbc.co.uk/rd/pubs/reports/ you can download all the BBC reports on panel absorbers which will help with your designs.

cheers
john