Bass traps

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pandamonk

pandamonk

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Right I've been thinking for a while about acoustic treatment in my studio, and with the help received here and a little bit of info from the acoustics class in college, I've came up with what I wanna do for my acoustics.

Ok, I have an idea for bass traps, and I'm wondering if it is correct or not:
Using perforated MDF, plywood or hardboard, with ultratouch acoustic cotton, or rigid fiberglass, all covered in fabric, as shown, across the corners.

The perforated MDF will act as a helmholts resonator, I'm hoping, with the ultratouch acting like a standard broadband, across a corner, absorber(with the holes in the MDF). Is this a good idea or would i be better building a standard broadband bass trap?

Also, if this works, will it still work with a 4'x2'? Or does it need to be sealed?
 

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The BBC did a white paper years ago about Helmholtz resonators and they determined it wasn't necessary for the space behind the resonator to be sealed air tight.

I think you are on the right track. You may want to use various sized perforations to get a little more broadband than a single-size hole will allow.

Do a search around here and see if you can find the pics of Sjoko2's studio. His control room illustrates using various holes in a spiral pattern for resonators.
 
c7sus said:
The BBC did a white paper years ago about Helmholtz resonators and they determined it wasn't necessary for the space behind the resonator to be sealed air tight.

I think you are on the right track. You may want to use various sized perforations to get a little more broadband than a single-size hole will allow.

Do a search around here and see if you can find the pics of Sjoko2's studio. His control room illustrates using various holes in a spiral pattern for resonators.
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Cool, yeah I'll have a look.

Emm, doesn't the distance behind the hole affects what frequency, as well as the size of the hole? So having it on the corner will provide a broadband range. I know that the size must affect it, but if the distance does too, then i think il just get the cheapest perforated board i can find, and that with the ultratouch should provide resonable broadband absorption.

Cheers
 
I've searched for half an hour and can't find any pics of Sjoko2's resonators. I found his website, but there aren't any good pics of the studio which show them.
 
apl said:
I'd just skip the perf and put up the cotton.
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If i do that, what should i frame it with, leaving the edges exposed, or at least relatively? I was thinking mesh, but you can't staple the fabric to it. That was one benifit of the perf. 'cause i could just staple the fabric to it holding the cotton in place, leaving the edges exposed, and hopefully providing better low end absorption in my 6'6"x7'6", with 6-6'9" sloping ceiling, control room.

I can only add absorption across the corner at the back of the room as well.

This is what It'll be like, hopefully.
 

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Wow, that's tough. The room is way small.

Can you straddle the wall ceiling corner? Can you put some on the ceiling?

P2030038.jpg


I used 703 which is stiff enough that it doesn't need a frame. I just wrapped it in fabric. I'm not familiar with the cotton.
 
Yeah i can straddle one wall ceiling corner at the back as shown in the pic.

I know it's way small, but I'm just young still living with my parents. It's a shed/bomb-shelter at the bottom of the garden. The bomb-shelter has walls 3 bricks thick, with a room 9'x5' which I'll use for drums, what a squeeze it'll be, a "room"(if you can call it that) 2'x9' which will be for vox, the shed is built onto that and is 14'x8', and will be split in half(bad idea i know, making a small room even smaller, but i feel it's necessary, for what i need anyway), this will make 2 7'x8' rooms, but I'll obviously lose about 3" all round with the walls, and 6" with the partition. Anyway, that's not the topic of this thread.

I think the cotton is a lot less rigid than 703, so will need a frame of some kind, or the board at the back.
 
apl said:
Wow, that's tough. The room is way small.

Can you straddle the wall ceiling corner? Can you put some on the ceiling?
<img removed>

I used 703 which is stiff enough that it doesn't need a frame. I just wrapped it in fabric. I'm not familiar with the cotton.
Click to expand...


Hi APL.

How did you attach the 703 to the walls and corners? Did you put the fabric on first, then attach, or vice versa. What did you use for fasteners?

I've been thinking of several different ways to do it and haven't settled on any one way to make it look clean and professional.

Thanks,
DC
 
apl said:
I wrapped them first then put them in place with push pins. The two hanging from the ceiling are help up by strings and self adhesive hooks.

QUOTE]

Ah, I see it now. Hadn't thought of that. Looks good!!

Thanks for the quick reply. :)
DC
Click to expand...
 
Right I've been reading about and found something called a BCA, Broadband compact absorber, which seems a lot like my design, except it also has some absorpent material behind.

I've read that these are used in anechoic chambers, and provide good absorption down to 50Hz.

I have some foam that a bought a couple of years ago. Do you think i could use this behind, with the ultratough infront, like shown?

Does anyone know much about this?
 

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