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Post by indiehouse on May 30, 2019 13:22:31 GMT -6
You don't want a solid plywood back. You want it open. It will be more effective with an air gap between it and the wall. I built mine with 1x2's, reinforcing the corners, same dimensions as the 703 panel (that way you get more surface area for absorption on the sides). Then I stapled a piece of the fabric you find on the underside of couches. You can get the fabric stuff at any fabric store. Then I layed out my bass trap fabric on the floor (basically any fabric that you can blow air through). Then, place the 703 panel. Then, place the frame right on top of the 703 panel, with the black couch fabric facing the 703 panel. Pull the panel fabric and staple to the inside of the back of the frame. Now you have a built in air gap. Hook and wire and you are done. Exactly what I do, except I bought many yards of burlap (the non-shedding kind) of Ebay a million years ago and used that. Works in a barn. Here's a shot of free standing 4x8 panels I also made one with the back shown. These are 4" thick. Instead of hook and wire, I screwed short pieces of 1x2 in the wall and hung the smaller ones on that. That's sweet. |
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Post by swafford on May 30, 2019 13:43:08 GMT -6
Thanks. Those panels are handy. I turn them fabric side towards the rack, side to side to make my 'mix room'. There's usually a 4x6 panel hanging on the wall behind my rack (you can see the wood strips.) I have 4 of those hanging on the walls or in storage in the hay loft, along with corner traps and 2'x4' panels I can take off or put up to get more or less room (rough cut yellow pine panel). Out of 2"x6" board I made some feet with openings I can wedge 2 4'x6' panels fabric out to make gobo's when needed. My space is open, so modular is important. That 703 was a serious Craigs List score. |
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Post by swurveman on May 30, 2019 15:38:19 GMT -6
I've always wondered about this. So, I hope you don't mind me asking: I built my bass traps from the DIY Joel Dubay PDF. The OC703 sits on top of a 2" frame with ticking fabric across the frame. So, it is built 2" away from the wall. Should the panel be hung an additional 2" from the wall with spacers screwed into the frame , or is the original 2" enough? Yes an airgap increases the effectiveness of the trap. However, filling in that gap with more insulation is better still. So 2” trap with a 2” gap isn’t quite as good as a 4” trap flat against the wall, make sense? Also, a 2” trap isn’t really a “bass” trap. It’s not thick enough to do much meaningful absorption at lower hz. 4-6” (preferably with an air gap”) would make better bass traps. I must have miscommunicated. I have 4" and 6" thick OC703 sitting on top of the frame. So, given that I don't have 12" absortion panels, which would be even better, does the 2" gap between the 6" panel and the wall need more than a 2" gap, or is the 2" gap adequate? |
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Post by sirthought on May 30, 2019 16:26:11 GMT -6
That 2" should be adequate.
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Post by Tbone81 on May 30, 2019 17:11:29 GMT -6
Yes an airgap increases the effectiveness of the trap. However, filling in that gap with more insulation is better still. So 2” trap with a 2” gap isn’t quite as good as a 4” trap flat against the wall, make sense? Also, a 2” trap isn’t really a “bass” trap. It’s not thick enough to do much meaningful absorption at lower hz. 4-6” (preferably with an air gap”) would make better bass traps. I must have miscommunicated. I have 4" and 6" thick OC703 sitting on top of the frame. So, given that I don't have 12" absortion panels, which would be even better, does the 2" gap between the 6" panel and the wall need more than a 2" gap, or is the 2" gap adequate? Ahhh...gotcha! So yeah, any additional airgap would be good but the larger the better (within reason of coarse). One of the things you're trying to accomplish by adding an air gap is to allow more sound (air pressure) to travel through the trap, bounce off the wall, and make a 2nd trip through the trap. You're also trying to physically extend the trap closer to the 1/4 wavelength of lower Hz soundwaves. IME practicallities like furniture placemnt etc dictate how much of an airgap you can leave. |
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Post by Quint on May 31, 2019 10:44:42 GMT -6
For those of you considering making a panel to put across a corner as a bass trap, why not just build a super chunk instead?
Pink fluffy insulation is cheaper than OC703/Rockwool AND has better gas flow resistivity (GFR) for the purposes of trapping bass, not to mention that it fills out the entire corner instead of leaving an air gap.
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