Originally Posted by FOH
Arny, I know you know this too, .. but that's operator error, if they were trying to affect below 100hz.
How much room can you utilize for bass trapping?
I inquire, because the most effective broadband bass trapping is fortunately, just about the cheapest. If you could fill as much of the area behind the screen as you can with loose/fluffy batts, it's the simplest, and most effective you can implement.
I'm talking 12", 18", 24", this would make for a superb bass trapping approach. And it's most likely a great deal less than a lot of rigid 703.
I believe I have about 34" from the front wall to the back of the screen. I need room for 3 LCRs that will be on stands to fit inside the screen height and 2 subs. I also possibly need room for some 8" flex duct as I have a dead vent in that space emptying into the room (not my first choice, but space outside the room dictated where it had to go). I had considered just leaving the 8" vent open and letting the air flow through the AT screen and the fabric that will be on the screen wall, but if you're suggesting I fill a lot of that space in I can actually direct it to an exit grill on the front wall somewhere.
I should note: the intended 703 superchunk material is already purchased and cut. I was planning on assembling them tomorrow. However, I can add more behind the wall if that's the general consensus.
oh.. and thank you
Originally Posted by GIK Acoustics
To answer your direct question, yes. You can use liner directly over the superchunks without any loss. As it is stated in the post above, if you fill some of the empty space from wall to wall, between the front wall and the liner (I'm assuming a false wall) with pink fluffy fiberglass, you can get a lot of great bass absorption in the room.
Thanks! My main driving force for asking was because I want everything behind the screen to be black as well as prevent any fiberglass fibers from collecting on the screen material. I thought I could save a bit on wrapping the superchunks in black fabric by just covering them on the duct liner I was already planning on using. If I add some pink fluffy in that space, can I just shove that in some thick pockets of duct liner? Stuff it in bags of black fabric? Is this a case of more is better or is there a too much point?
And thank you, too
Originally Posted by Ethan Winer
Thanks for moving this to the forum. You're already getting good advice, but I can add a little. To answer your direct question, adding more rigid fiberglass in front of rigid fiberglass already used as a corner chunk is fine. But most rooms do not need absorption all over the front wall. At least not if the rest of the room is treated properly. This is such a common misconception that I wrote this article to explain the issues:Front Wall Absorption
Also, rigid fiberglass bass traps can indeed target problems well below 100 Hz. But it has to be thick, and also cover enough total surface area.
Ethan, when you mention the rest of the room you bring up a secondary question. I'm not sure which theory to follow: 1) Treating all the way around the room up to ear level or 2) treating the early reflection points.
However, going back to my above statement of being a too much point: Should I choose to line the entire front wall, am I hurting the room (potentially) or just risking wasting materials? I'm trying to get a better understanding of what is actually happening inside the room.
And a third thanks is in order, sir.
I suspect I'm going to have a question about rear wall diffusion here pretty soon, also