Bass Trap Help

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

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