Bass Trap frame sides, side holes or not? Ideas?

Started by StudioInProgress on 17 August 2004. 6 replies.

Originally posted at johnlsayers.com, topic 2140.

I'm about to start building my bass trap frames (fabric back and front). I'm thinking of drilling large holes in the side frames all the way around for more open entry area. All I can come up with is using a large drill circular bit. Lots of holes though. Maybe a jig saw or something. Ideas anyone? Will I get enough results to warrant the work entailed making the holes or would front and rear entry suffice?
Is everyone asleep at the console? :roll:
What do you mean more open entry??? A place for sound to go in ?? Dont that that is needed. Sounds like a waste of labor.
That's what I needed to hear. I was thinking in the lines of Real Traps originally from my last post and noticed the traps having cut outs all along the sides. Maybe that was a design idea to lighten the frame and nothing else.
The more absorber surface is exposed to the air, the more sabins of absorbtion you will get. Thus you get more absorbtion without a frame. You get more absorbtion still by having it out from the wall, both because it's effective at lower frequencies as well, but also because if you can touch the back side, then the back side starts absorbing the around the side reflections/defractions too. I believe the change is larger than the change in surface area (defraction etc). But to keep things simple, if you have a 2'x4'x4" panel, geometrically the sides can contribute an additional 50% of sabins if they are covered in speaker cloth. If you have a 4" airplane frame, that's got 3.5" holes in it with half inch spacing, that's 30% more aborbtion. As for if this is worth the labor, that's up to you. I'd ask if adding frames is worth the labor. If you put the side of the frames against a wall, then air can't get to that side, so there's no change if there's holes there or not. If you put the frames against each other, then again the air can't get to the side, so there's no change if there's holes there or not.
z60611, love the name... not sure what it means but -believe it or not- I lived the first 15 years of my life at a 611 address and another 17 years at a 606 address and my wife also lived at another 606 when I met her. No reference to the letter z though I did live at 611 near the zoo. So, let's see...I'm framing because I need stability in my panels and a way to stand them. Maybe I should have thought of something like chicken wire but I'm into the wood framing already. I plan on using them caddy-corner away from the wall. I was actually going to keep the frames raw and possibly cut 2" holes in a long series. Now I'm thinking of covering the entire frames in cloth. Not sure how much all of this is going to matter being I more than likely will never monitor at extremely loud volume. Thoughts?
I was actually going to keep the frames raw and possibly cut 2" holes in a long series. Now I'm thinking of covering the entire frames in cloth. Not sure how much all of this is going to matter being I more than likely will never monitor at extremely loud volume. Thoughts?
Z60611 gave an excellent summary. The holes won't hurt. The monitoring volume is irrelevant. The traps will deaden the room echos regardless of level. Have fun! Andre