But seriously, acoustic foam is one of the biggest scams ever perpetrated on naive and gullible audiophiles.
FALSE!
We’ve already gone over this in at least one other thread. Consider that GIK Acoustics acknowledges that 4 inches of acoustic foam panels equates to 1 inch of their fiberglass (and other materials) product.
Any other tips and advice about proper installation would be appreciated.
OP, I use foam acoustic panels, albeit not on concrete http://halr.x10.mx/AV.jpg
In my case they are mounted three different ways. Bass traps in the corners were adhered with a 3M spray glue. Wall panels were adhered with a 3M velcro strip. The ceiling panels were installed with (less than desirable and very few) carpet tacks.
Try the velcro strips in your case.