NetWell Noise Control has been in the foam business for 20 years. Some ideas. First, there's a difference in foam types. Bedding/packaging foams don't carry the same pores per sq inch that polyurethane foams do that are used in acoustics. Be sure it's not just "any" foam you are targeting. Second, the mid and high frequency sounds are indeed absorbed more than low bass tones, unless you thicken the foam up. By bumping from 2" thick to 3" thick, you triple the effect down at the low bass end. 2" thick panels carry NRC values of .15 at 125 Hz, pretty weak, but 3" thick panels carry NRC values of .44. Overall NRC values of 2" thick panels are NRC valued at .50 while 3" thick panels are NRC valued at 1.00. This is why you see foam in studio settings. Not because it's less costly, but because it does indeed work if the right thickness and quantities are installed. Do not put 1" or 2" thick panels in studio settings, you are throwing money away. Also, cloth wrapped Fiberglass panels are also common in studio settings. There, a 2" thick panel will equal the absorption coefficients of a 3" thick foam panel, but cost more because of the cloth that is used to wrap the panel will. A more expensive product to make, sound values are comparable. Hope this helps!