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Post by jcisbig on Oct 22, 2016 17:48:08 GMT -5
If you can put in corner bass traps in the rear to leave room for more broadband panels on the real wall, that may help with both the remaining clap flutter and the low-end absorption. May also want to consider a pair of 2x2 ceiling panels for your ceiling first reflection points. That's a good thought. The only thing is that doing things that way may not help reduce the low-end reflections that are bouncing off the back wall and cancelling or reinforcing other bass waves to create nulls and peaks. |
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Post by leonski on Oct 22, 2016 17:58:50 GMT -5
think DIFFUSION.
I don't see much difference between 'before' and 'after' plots. A few MS in the decay and a few DB in the peaks. Certainly not night and day.
Bass is the WORST to deal with. If you have another ROOM next to the listening area, you might consider cutting a slot and creating a helmholtz at a frequency which is the most pesky.
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Post by saru on Oct 22, 2016 18:49:13 GMT -5
If you can put in corner bass traps in the rear to leave room for more broadband panels on the real wall, that may help with both the remaining clap flutter and the low-end absorption. May also want to consider a pair of 2x2 ceiling panels for your ceiling first reflection points. That's a good thought. The only thing is that doing things that way may not help reduce the low-end reflections that are bouncing off the back wall and cancelling or reinforcing other bass waves to create nulls and peaks. Your nulls and peaks don't look that bad to me, judging strictly from that after-treatment waterfall (though of course you're the best judge of what's missing, since you can actually hear the results). Nulls at what, 56 and 120-ish are the concern? You might try a combination of broadband panels and a large bass trap panel at the rear wall, or play a bit with placement of your sub... would you consider a second sub for better coverage on those troublesome frequencies? In any case, the lack of improved decay times at the low-end seems to be a bigger issue than the nulls/peaks. Are your corner stacks segmented, so that you could take half of each stack and stick them in the rear corners? That might be a quick way to see if that kind of placement would have any effect without taking the time and effort to build the rear stacks first. |
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Post by jcisbig on Oct 22, 2016 19:20:51 GMT -5
That's a good thought. The only thing is that doing things that way may not help reduce the low-end reflections that are bouncing off the back wall and cancelling or reinforcing other bass waves to create nulls and peaks. Your nulls and peaks don't look that bad to me, judging strictly from that after-treatment waterfall (though of course you're the best judge of what's missing, since you can actually hear the results). Nulls at what, 56 and 120-ish are the concern? You might try a combination of broadband panels and a large bass trap panel at the rear wall, or play a bit with placement of your sub... would you consider a second sub for better coverage on those troublesome frequencies? In any case, the lack of improved decay times at the low-end seems to be a bigger issue than the nulls/peaks. Are your corner stacks segmented, so that you could take half of each stack and stick them in the rear corners? That might be a quick way to see if that kind of placement would have any effect without taking the time and effort to build the rear stacks first. Yes, I'm planning to add a second sub soon and that may help with a lot of the peaks and nulls that I'm experiencing. That's a good thought to try some other locations for my bass traps! I'll move them around when I have some time and re-measure to see if that yields any better results. |
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Post by vneal on Oct 22, 2016 19:45:31 GMT -5
If you do 1 thing= BASS TRAPS
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Post by leonski on Oct 22, 2016 22:07:29 GMT -5
If you have any Large-ish friends, get 'em over for a listen and some free food. Stand 'em in CORNERS for a start and listen to bass heavy material. People make a reasonable, cheap and easily moved substitute for fixed traps. And yes, a 2nd sub PROPERLY PLACED will help the peaks/ valleys thing. The Harmon Group white paper is a wonderful place to start. www.d-toolsblog.com/newsletter/bass-multiple-subwoofers/I can't find the ORIIGNAL paper very quickly, so this will do for a start. Take the time to track down the original paper. |
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Post by yves on Oct 23, 2016 12:13:06 GMT -5
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Post by leonski on Oct 23, 2016 13:59:06 GMT -5
Just TRY a couple friends standing in the corner and you tell ME if you can hear the difference. It works.
Good on you, yves, finding the original link.
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Post by yves on Oct 23, 2016 14:04:33 GMT -5
I have full floor-to-ceiling bass traps in my front two corners. How about also treating at least 6 of the 10 remaining corners of your room with corner bass traps as well as vastly increasing the thickness of those corner bass traps wherever possible? |
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Post by yves on Oct 23, 2016 17:21:39 GMT -5
Just TRY a couple friends standing in the corner and you tell ME if you can hear the difference. It works. Good on you, yves, finding the original link. While it is true the fact that people absorb at least SOME sound waves, there is still no comparison between a person standing in each corner of the room and having actually installed corner bass traps. |
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Post by leonski on Oct 23, 2016 18:48:18 GMT -5
Except that for an EXPERIMENT it it s LOT less expensive to get a couple buddies over and go the expense of some beer and maybe fire up the grill.
It's much easier to get people to move, too, than change what is essentially a fixed installation.
Overdamping a room is a real bazard. And this is true even though BASS is the worst to deal with.
I think analsis is indicated before construction and installation of all those traps. And if you have a one frequency problem? A TUNED trap in the form of a helmholtz resonator might be possible. The last is pretty iffy,
but IS on the table. As weird as it would appear, my DEN was a helmholtz, though unintended. I had my sub in one spot and my DEN was boomy and one-note. Moving the sub about 10 or 12 feet to behind the OTHER speaker and out of a corner fixed the issue and straightened out the bass. The Listening Room is VERY oddly shaped having 8 walls and is maybe 4500 to 5000 cubic feet.
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).