Slanted ceiling trap

How to use REW, What is a Bass Trap, a diffuser, the speed of sound, etc.

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Kaj
Posts: 116
Joined: Sun Aug 29, 2004 12:14 am
Location: Sweden

Slanted ceiling trap

Post by Kaj »

Hi! :D Several times in this forum I'd read about problem in small studios to be able build as members would like due to too low ceiling height to slant, and losing space when building traps etc. I have not enough knowledge speakless of experience in testing ideas like my simple drawing below. I thought that it could be possible to combine bass trap/absorbers with slanting of the ceiling. My drawing indicate that the slats are on the short side of the trap, my thinking :oops: is that:

To have slats on the small opening to give bass trapping (as a corner bass trap with slats, to put the slats on the bottom part would .... correct me if I'm wrong, be as a normal wall unit, if the insulation lays on top of the slats in that type I might be far out in the thin air but, still like to ask the question:

1. Is there anyone out there that knows if this is a possible solution to do treatment of a small room?
2. If yes, has anybody got a good result?
Kaj
John Sayers
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Post by John Sayers »

Kaj - that's an interesting idea and I'm sure it would work to break up floor/ceiling parallels.

cheers
john
drfrankencopter
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Post by drfrankencopter »

I'm cursious as to why you wouldn't put the slats on the other surface (the longer one)? It won't be as deep, but will be working on a much bigger area...

Cheers,

Kris

PS: Neat idea! I may use it myself.....
John Sayers
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Post by John Sayers »

good point kris :)

cheers
john
ekki
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Post by ekki »

Seems like a good idea. Im not at all an expert in this but i guess a potential problem is you might have high frequenzie first reflections from the slats getting back to you... :? and if you turn it the other way you still need som hard material facing front of room to get the absorber airtight... still reflections..
Phat & Phunky
drfrankencopter
Posts: 186
Joined: Sun Apr 03, 2005 1:09 am
Location: Ottawa, Canada

Post by drfrankencopter »

If the trap needs to be sealed on the sides, put an MDF or plywood panel on the short side, but stick some 703 (or other rigid fiberglass) on the face of it to kill any high frequencies that hit it.

Assuming a trap about 12" deep, the front will only act as a reflector for sound with a wavelength less than 4X this amount. This would be about 250 Hz and above, so 2 " of 703 on the front should work very nicely. Sound below 250Hz will just diffract around the edge.

As far as how to position them, I'd go with the short side facing the monitors, so as to slope the ceiling up away from you.

Cheers,

Kris
Kaj
Posts: 116
Joined: Sun Aug 29, 2004 12:14 am
Location: Sweden

Post by Kaj »

Thanks all for your input, BTW I choosed the slats on the short side to create something similar to a corner bass trap, the slats is more cosmetique, fabrics could be used instead to control reflections. To put the slats on the bottom part, would give me a broad band trap??? I thought that the bass is the most important to treat, thought you need more trapping in small rooms than large to treat bass coloursation, but not sure. And in addition to this ceiling to use wall units tuned for the modes :)
Kaj
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