acoustic tiles stick or hang?

hi all, I have just purchased some acoustic tiles for my drum practice/recording room... http://www.comfortex.net/acoustic_foam/afw100.htm I guess I now need to begin learning all I can about where to place these and/or any others I buy.. However I read on another forum that they should not (as advised elsewhere) be stuck directly to the wall or doors but kept just off them using a spacer or sim? Is this correct info. do you guys have any ideas or tips??? I dont know what to search for in the forum so sorry if this is asking for "old" info... Thanks Geoff

Geoff, That company has recently done a huge amount of acoustic measurements. Without having checked them in detail they seem to be good. That's a huge sculpter just using his existing capabilities for the acoustic market but with a foam they specially purchase for this acoustic stuff seemingly having good fire properties (not as Melamine foam of course). However such tiles are mainly good in mid and high and do little in the lows. Using too much of it and your room even feels irritating. One should aim to a more linear absorption (more equal in lows and high) than these tiles can provide. You can improve that by hanging them from the wall and ceiling on a cavity. But you have to find a solution to do that, since standard such boards are not foreseen to be used as such. With a bit creativity you maybe come a whole end yet. However stupid it sounds, gluing these things upside down will improve on them as well. This sculpting is still a bit to much related to psychology rather than acoustics. But it can be usefull to use corner traps as well. I know they do have them and tested them. If remembering correct, but not being sure now, and without checking I even think they have from these large sized ones. How to position what and where? Just have a look to sites as Realtraps, GIK acoustics or Ready Acoustics and you will find scetches how they place there absorbers in the room. It doesn't matter that your's are foam, the idea remains the same. I can't compare prices, I think they are relative cheap (assumption now), but you can also think on extensions with DIY mineral wool panels and traps as very extensively described a lot here in the forum yet. The way they handle that foam is rather original in forums. These people don't claim to know a lot about acoustics, aren't even hardly interested, giving dry information, made sure they were acoustically measured, use a special selected foam and it's up to the customer if they want them or not. In less than or around a year they seem to have had > 1000 customers (in as far this info is correct of course). For them it's just a matter of using their already existing infrastructure and machinery for another additional market. But unlike FBM they bothered to select a suitable foam and test the (about copied) produced designs.