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Steve,
> GIK is definitely another option I'm considering. Do you know what kind of material are they made of ? <
I'm pretty sure Glenn is out of town so I'll help out on his behalf. The GIK panels are made from 8 pcf mineral wool.
BTW, as far as I know all of the vendors specify the core materials on their sites. For example, RealTraps uses 705 and we add a limp mass membrane to increase the bass absorption even further.
--Ethan
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