Hanging foam at the ceiling as bass and lo bass absorber

Hi, I'm going to modify my rehearsal room so it would be good enough for rehearsing and also recording. The problems are low and low mid frequencies. And I have questions. I read that if we place an Owens Corning 703 with a distance from the wall or ceiling, they would absorb more bass. And I also read that some of the low mid absorber designs involve putting 703 inside cavity box, but it allow some distance from the back of the box. How about if I just hang some 703s up in the ceiling, so it would be hung with wires, like clouds, with an amount of distance from the ceiling, maybe varying the distance between each 703s? Will it good enough to absorb bass and lo mid frequencies, or still I have to use cavity box? And more question, I assume from what i've read from the realtrap website, is that the more bass trap you put, it won't make the low being absorbed too much, instead it will make the low frequencies more even in the frequency range. Is that true, or am I missing something? Thanks in advance.

How about if I just hang some 703s up in the ceiling, so it would be hung with wires, like clouds, with an amount of distance from the ceiling, maybe varying the distance between each 703s? Will it good enough to absorb bass and lo mid frequencies, or still I have to use cavity box?

Putting a frame around the panel (cavity box) has nothing to do with how it performs. It is the rigid fiberglass that is doing the work, so hanging from a wire will work fine. Keep in mind though that just spacing panels off the wall will NOT be enough. You really want to straddle corners also with the OC703, making the panel 4" or more thick.

And more question, I assume from what i've read from the realtrap website, is that the more bass trap you put, it won't make the low being absorbed too much, instead it will make the low frequencies more even in the frequency range. Is that true, or am I missing something?

Well to say you could never have enough bass trapping would not be true, but in most small rooms you would run out of corner space before you installed to much low frequency absorption. I would not worry to much about over doing it. You can though over absorb the high end and that is why products like Real Traps and ours are designed to absorb more low end then high end. Glenn :D

Hi, thanks for the answer, Glenn. I post the drawing of the room with my idea of hanging the rockwools (or 703s) below the ceiling. They would be covered in burlaps, and hung by wires nailed or bolted to the ceiling. The distance between the ceiling and each rockwool will be calculated later. (Or any suggestions?) Really sorry for the crappy picture, I'm still learning to use the sketch up, and I still trying to find out how to draw the wires from the ceiling to each rockwool. But I hope it shows the basic idea of what I'm planning to do with my room, so people here can see it if I'm doing the right thing or not. So, is it going to be effective? BTW it only shows the ceiling part, the wall parts are already treated with rockwools, and a full slot resonator on one side of the inner walls. Thanks in advance, Ari

Oops, sorry. Wrong question about if it's effective, of course I'm going to put traps on corners also. I mean, is it ok if I'm going to do it like the picture described? Thanks in advance.

I would jut space them the thickness of the panel. Spacing them at different will yield different results but how would you know what to target? :D Just play it safe and keep them all at the same spacing the thickness of the panel. Glenn

So that means, if I use 4" rockwool, the distance between the ceiling and the rockwool is also 4", is that right? Also, another question, what if I angled the rockwool so it won't be parallel to the ceiling and floor? Is it a good idea?

Yes, a good rule-of-thumb is to have the panel spaced from the wall/ceiling the same distance as the panel is thick. So a 4" panel should be 4" down from the wall/ceiling. Angling shouldn't make much difference either way. Simplest is to just keep the panel at its optimum spacing throughout its hang.

So that means, if I use 4" rockwool, the distance between the ceiling and the rockwool is also 4", is that right?

You got it.

Also, another question, what if I angled the rockwool so it won't be parallel to the ceiling and floor? Is it a good idea?

No need the panel absorbs the sound. Glenn