cylindrical type diffusor

  • Thread starter Thread starter foreverain4
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Everybody, but especially Fitz - Just re-read your quote of one of my posts, and find it necessary to apologise for one of my "brain farts" - To quote Fitz,"Still don't understand the "sealing" or "airtight" criteria though. How can 703 be "sealed"? If the frame is only for holding the panels in place and for a fabric fastening point, what if you removed the frame? How and WHAT do you seal?" -

The simple answer to that is, you don't and you can't. The only explanation I can give for saying that would be either sleep deprivation causing me to "shift gears" and start talking about panel type traps, or just basic stupidity...

You're right, the compressed fiberglas is porous so it's not possible to "seal" it, per se. When it's used as a simple broadband corner trap, you can actually just lean it up in the corner and walk away, as far as acoustics is concerned. There is some slight likelihood that if you were to mount a piece of 703 on spacers off the wall, that a slight amount of lower frequencies could "flow around it", as lower frequencies are omnidirectional. However, I'm not sure how you would ever measure the difference. Plus, if the material is working to that low a frequency, it would be a few FEET off the wall.

The rest of that quote sounds like I may have actually been AWAKE while typing it... Stevezzzzzzz...
 
I think this brings something important about acoustics. That specs and the science of it all can sometimes be irrelavent. That what it all comes down to is whether or not it sounds good.

I say this because alot of professionals have a basic understanding of acoustics, but do not have near the knowledge you have in acoustic science, but they still know that if they put this here and this here, it sounds good. Just like with preamps, microphones, or any other gear, sometimes the specs just dont really make sense, but it sounds good.

Bleh, just a thought i had while analyzing all of this.

Danny
 
Good point, Danny - I've talked to pro's who know you sometimes can get the sound you want by moving a mic as little as 1/4" - but they can't tell you why. I feel that knowing why can speed up your choices of things to try, and how much change to make at a time. Both approaches will get you there - the pro because he's done it a thousand times, and just knows what will probably work. The "bookworm" because he knows the logic and will play with it til he hears what he knows is possible.

Now, if you happen to have BOTH of those going for you... Steve
 
Michael Jones said:
Nice job!
Don't they need to be sealed on the top and bottom?
Click to expand...



actually, i dont think they are supposed to be. from what i understood from my research..
 
Those panels look great. They definitely add a classy aesthetic touch, and they should provide good diffusion of the sound. Having several together like that should cover the broad dispersion that is needed for diffusion, where a single one by itself might not get that random mix that the theory says is necessary.

If the intent of these is just for diffusion, then my understanding is they don't need to be sealed. Additionally, with the stress applied to the panels by bending them, I would think that they actually would not make very good resonators like you would get if you constructed a membrane-style absorber, so they wouldn't need to be sealed from that perspective.

Now, back to the music.....

Darryl.....
 
Hello everyone. Sorry to have complicated this thread. Thanks for the comments, info, and clarification of things. Well, that pretty much sums up this one. Well its on with the design process. I should be able to post my room design this weekend. It needs all the help I can get. Ha! Later guys. Steve, hope you get some sleep and thanks for your review.....Darryl, you took the words out of my mouth. Thanks for your input.
 
Wyhat sucks is that while something sounds good today... it may not sound good tomorrow. My vocal booth sounded great until the last vocalist. It all of a sudden sounded...Boxy!

The difference was sheer volume.... most of the singers I have had in there were moderate in volume. The last singer could stand next to the guitarists amp (Dual Rect Live) and out do it. Make sure your treatments are easily modified to accomodate several different types of things. Back to the drawing board for me... literally.

SoMm
 
Where are those "power soaks" for vocal booths when ya really NEED 'em... Maybe you could put the whole freakin' band in the vox booth and give "lungs" the rest of the place... Steve

Seriously, though, if you have a couple-three extra pieces of foam or (better) fiberglas board, maybe you could hang them in the booth with about a 2-3" gap, in front of the existing treatment - "boxy", to me, means too much mids so you may need more absorption in that range, which would require more gap between the absorber and wall...
 
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