I haven't had a chance to watch the video, but I have read the comments about it on this link:
If it's right, a 4" trap with 4" space will absorb 423Hz frequencies and a 6" trap with 6" of space will absorb 282Hz frequencies. Doesn't sound good. What are anyone's thoughts?
HiFi / A/V / Bedroom
Certainly proper room measurements are important before claiming 'provable' gains. I 'know' my corner traps have had a huge effect on the room since the significant boom outside my listening area disappeared completely. Exactly what frequencies were absorbed or how significant the changes made in the listening area is entirely subjective until I buy a decent mic.
At least its science and not snake oil!
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System Photos - http://s1051.photobucket.com/user/robinkidderminster/library/?sort=3&page=1
Base trap Project - http://www.whathifi.com/forum/home-cinema/corner-base-trap-completed-project?page=1
If you are going to buy acoustic treatment rather than build it yourself than ask to see the test results. The results will either be in sabins and absorption coefficients.
If in Sabins the higher the number the better. Basically you divide the surface area by the sabins to get the coefficient.
A coefficient of 0 means it does not absorb anything at that frequency and 1 means 100%
Basic of bass trapping is that the more area you cover and the deeper (not denser) you make them the better they perform. Tri traps with no airgap perform best.(down to abut 45hz) If making panels to straddle a corner they need to be at least 8 inches thick to really tame those lows
If you get a chance go and check out our education pages on our site, has loads of short articles and videos explaining how it all works
General Manager GIK Acoustics Europe
Thanks for that sheggs. I was actually looking at tri traps on your site the other day, although I think finances mean they're not an imminent purchase. Do you have a link to test results for the tri traps?
I do they are here -
(you need to click on the test results tab).
Our tests are in sabins (mainly becaase the coofficent absorption chart only goes down to 125hz.
If you do the conversion though I think it works out at about 72% (0.72) absorption at 45hz (and obviously better the higher you go)
That's helpful, thanks. How much extra does it cost to have a non-standard height of tri trap? If you click on the 'hi fi' link in my signature you will see that there is an alcove in the space behind my left speaker. From the tri trap measurements (although I'm not sure if 'width' is the length of the two sides or from the corner to the longer side) the standard size wouldn't quite fit in.
Is it the height you are worried about or the amount of rom they occupy?
The height. Although I suppose I could have it outside the alcove? Presumably it'd work ok with space behind it and would still be stable?
It really needs to be against the wall if possible.
To do one smaller would be £10 plus VAT custom fee per trap, feel free to emal at firstname.lastname@example.org if you have any further questions
Ben. Love the side panels but wonder if they are acoustically transparent and thick enough? If not and not then please don't take this as critisism since from my own much earlier post 'compromise' is always necessary. I could see a bass trap.in the alcove cut to match the curve?? Nice looking area.
the acoustic panels were done as a bit of an experiment. The material for the side panels I think is reasonably suitable (can breathe through it), the back panel less so. I recently got an image of my son that I'd quite like to make into a panel, which is why I was on the GIK website, looking at their art panels. Side panels would be my third priority after rear panel and some bass traps. Reading up on some articles such as the one I posted, I don't think a home made trap would achieve what I want, so I think paying someone like GIK to do it would be the best solution. I also don't think my DIY skills are up to curved frames! However, two tri traps and a large panel plus delivery is probably around £500. I don't think I can really afford it. Am mulling it over.
Looking again at ur pix .... Mmmmmm..Tricky! Personally I would experiment with rockwool hoping to convince myself that treatment was not greatly beneficial..If not convinced and the experiment showed the traps to be beneficial then I would make some temporary traps and start saving. Are your speakers equidistant? The rhs seems further forward? My traps were simple to make at least for experimental purposes. Good luck Ben.
Speakers are equidistant. I've no real problems, I think it's a naturally very good room acoustically due to the sloped ceiling, the alcove and the L shape. There is zero echo from a handclap. I'm seated well away from the rear wall. So it's more an idea of making final improvements. For that reason, I don't want to expend the time (which is a rare commodity at the moment) on a DIY bass trap which at best is likely to absorb upper bass frequencies. I've never been entirely happy with the rear panel and I now have an image I want up in my house anyway, so I'm thinking I may as well spend a few extra quid for an acoustic panel as an ordinary one. The bass traps are probably an unnecessary luxury.
Anyway, thanks for the good luck wishes and I'll be sure to post if I make any major changes.
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