Are you talking specifically about the exact make I'm looking for? Have you looked at the specs for Acoustisorb 3? It's just as good, if not better, then the 50mm OC 705 equivalents.

.46 at 125hz and .78 at 250hz is pretty good.

http://www.soundblock.com.au/pdf/acoustisorb_3_data.pdf

I agree that their other stuff is poor as far as treatment goes.
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