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In Reply to: RE: Tube Bass Traps. posted by rosendds@frontiernet.net on December 01, 2016 at 03:57:46
I finished 4 36",20" dia. traps & have a pr.in each of the rear wall corners set with the uncovered fiberglass side out.I can tell you that they made a much bigger than expected difference!The bass bloat and hang is greatly reduced & the bass is tighter & more defined while the mids and highs are more clear with a larger ,wider sound stage.I should have another pr.for the front wall corners done by next weekend.Making the traps was the way to go vs improving any of my electronics which without the room treatments would not have been very significant.
Follow Ups:
The foil is in the way of the absorption because it is not porous, so you would get more of the absorption with it off. So take the rest of the foil off if you want more absorption - which I would guess you do.
I did remove the foil,but as I was doing it I was wondering if leaving it on 1/2 of the tube instead taking it off & going back and covering 1/2 with 4ml plastic would act as a good diffuser when positioned with that foil side out.
Do you need diffusion where you are placing the traps for bass absorption?
There are round shaped diffusion panels so I suppose this could be used that way, but I doubt the useful locations for bass traps would coincide with useful locations for this kind of diffusor.
The ASC tube traps can act as diffusers for the highs and mids if the reflective side is pointed into the room.I was thinking that the tube traps in the front corners of the room might work well to have the reflective pointed out into the room so as not to deaden things too much.I will see how it goes when I finish them.
Can I find my room bass nodes by ear?Putting two 20" tube traps in the corners of the rear wall made a big difference in improving low & mid bass definition as well as mid & high imaging.I put a two more tube traps in the right corner on the front wall which is about 10' from the back of the rt.speaker and I'm not sure that it improveed the bass,but with the absorbtive side out it dulled the mids & highs.
You can walk the room and listen for spots where bass is particularly strong and also bend at those locations to see if the bass prominence is still there.. The big bass spots are good places to try placing bass traps. If you got all the practical positions taken care of then you will probably not benefit from further trapping.
I was surprised how much having the absorptive side facing out affected the imaging considering it is one 6'trap in the rt.corner on the front wall over 10" from the speakers.When I rotated the trap so the reflective side was out,the imaging improved.If I find that the front wall trap doesn't smooth out the bass any more,I will place it in the center of the rear wall flanked by 6'tube traps in the rear corners.
Did you have both traps turned around or just one? If just one then the asymmetry might have been more significant than the fact that it was absorption vs. diffusion. If both then the diffusion is obviously what you need, which is what is generally observed for maggies and their front walls.
I had both traps facing the same way.The biggest improvement was gained by the traps on the rear wall in absorption mode.
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