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swiss toby
member

Joined: 09/04/03
Posts: 113
Loc: UK

Really easy bass trap?
#54405 - 25/11/04 10:48 AM

Can someone tell me whether this design for a really easy to make bass trap will work?

I can get a pack of 2 slabs of Rockwool RW6 1000x600x75mm, which will have a total thickness of 150mm and I presume come wrapped in plastic. So I don't have to deal with cutting it, spraying it with PVA and generally getting my hands dirty, is there any reason why I can't just fix the whole plastic-wrapped pack onto a 1000 x 600mm sheet of MDF or plywood then wrap it in fabric and hey presto! one big f***ing bass trap for about 35 quid.

Seems far too easy to be true but I thought I should ask...

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Don't call me 'member'.

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thefruitfarmer

Joined: 01/09/04
Posts: 1672
Loc: Kent UK

Re: Really easy bass trap? new

[Re: swiss toby]
#54420 - 25/11/04 11:32 AM

What you are suggesting is essentially what you would do to make this kind of broadband absorber.

You may find that the plastic covering has some effect that you do not want though.

Also, are going to need more than one bass trap. What you need is to arrange the traps across the corners of the room and they need to be fitted in a symetrical fashion to keep the reponse even.

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Scott R. Foster

Joined: 24/11/04
Posts: 357
Loc: Jacksonville, FL - USA

Re: Really easy bass trap? new

[Re: swiss toby]
#54714 - 26/11/04 02:42 AM

The wrap will act as a dampened membrane and add a steep peak... given it is pretty low mass stuff probably in the mid band.

Also by attaching material to a panel you lose the abilty to install it with an air gap behind... the air gap is a "free ride" to extra absorption.

I aint saying doing as you propose would provide useful treat menat [and be easy], but with a little additional effort you can get more bang for your buck.

Good Luck

--------------------
http://readyacoustics.com
http://forum.studiotips.com

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Paul Woodlock

Joined: 23/11/04
Posts: 791
Loc: Peterborough, UK

Re: Really easy bass trap? new

[Re: swiss toby]
#54718 - 26/11/04 03:12 AM

Quote beedeji:

Can someone tell me whether this design for a really easy to make bass trap will work?

I can get a pack of 2 slabs of Rockwool RW6 1000x600x75mm, which will have a total thickness of 150mm and I presume come wrapped in plastic. So I don't have to deal with cutting it, spraying it with PVA and generally getting my hands dirty, is there any reason why I can't just fix the whole plastic-wrapped pack onto a 1000 x 600mm sheet of MDF or plywood then wrap it in fabric and hey presto! one big f***ing bass trap for about 35 quid.

Seems far too easy to be true but I thought I should ask...

HOW MUCH!!!!

Travis Perkins retail price for RW6 x 75mm thick ( 2 in a pack ) is £19ish plus vat. Order even a few packs and you can get almost 30 to 40 % off with haggling.

Where are you buying that from?

And btw, you don't really need RW6 - It's really too dense.

Rockwool RW3 ( 60kg/m3 )or Rockwool RWA45 (45kg/m3 ) will do fine for bass traps, and as rockwool is priced by density, will be even cheaper.

Some branches of travis perkins sell the Rocksil brand.

Rocksil RS45 = rockwool RWA45
Rocksil RS60 = Rockwool RW3

btw - I've just order a lot of packs of Rocksil RS45 50mm thick, and I paid £11.10 + VAT per pack. There's SIX 1200x600x50 slabs in a pack. Even with lower quantities you'll get a MUCH BETTER price than the one you quoted.

I'd never pay £38 for 2 75mm slabs of rockwool. Whatever it's density

I hope you haven't bought it already.

Paul

p.s and fos right, leave the wrapping on, and you'll upset the properties. In any case you're better off making a wedge out of it to fit in a corner.

--------------------
Pauls Studio Build Diary at http://forum.studiotips.com/viewforum.php?f=1

Edited by Paul Woodlock (26/11/04 03:13 AM)

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swiss toby
member

Joined: 09/04/03
Posts: 113
Loc: UK

Re: Really easy bass trap? new

[Re: swiss toby]
#54761 - 26/11/04 09:53 AM

Thanks to one and all, the picture is now a lot clearer. Replies to my posts on this and other threads have taught me a lot so I think I can shut up and go and hassle TP now instead!

BTW Paul, I based the £35 figure on the price on Travis Perkins' website which is about £25, plus the board, fabric and VAT. I figured if it really could be done that simply then £35 would be a bloody good price given so little effort!

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