John Sayers' Design Forum

John Sayers' Recording Studio Design Forum

A World of Experience
Click Here for Information on John's Services
It is currently Wed Oct 22, 2014 2:42 am

All times are UTC + 10 hours




Post new topic Reply to topic  [ 4 posts ] 
Author Message
PostPosted: Wed Feb 15, 2012 1:53 am 
Offline

Joined: Sat Oct 22, 2005 9:37 pm
Posts: 44
Location: Ypsilanti, Michigan U.S.A.
I’m building and installing the bass traps for my room and I was hoping to get a consensus on adding thin kraft paper to the front of bass traps (OC703) to improve low frequency response.

I have conflicting recommendations from 2 reputable sources: One states I should for all bass traps that are not in a direct reflection location, the other states I shouldn’t use kraft paper in order to get the best broadband absorption. I think they are both correct but which philosophy might be better for my 12’x19’ room?

Anyone have any actual experience to help me determine which route to go?

_________________
Been playing guitar for over 30 years.
DAW: Recently switched from Pro-Tools to Reaper
I compose and record almost everything on my own.
Guitars are recorded direct via Axe-FX II.


Report this post
Top
 Profile  
 
PostPosted: Thu Feb 16, 2012 12:04 pm 
Offline
Moderator
User avatar

Joined: Sat Aug 25, 2007 10:54 am
Posts: 3727
Location: Exit 4, Alabama
Kraft paper will not improve LF since it has no mass to speak of, if anything it will reflect high frequency back into the room. And unless you have a sure fire type glue to stick the paper to the insulation, it can and will rattle(vibrate) and this is the main thing we all fight against.

So if you require a lift in high frequency you could add the paper, otherwise, it doesn't improve the ability of the 703 to absorb low frequency...at all ;)

_________________
Brien Holcombe
_____________________________________________
Sound: You can't stop it, you can only try to contain it.


Report this post
Top
 Profile  
 
PostPosted: Mon Feb 20, 2012 1:49 am 
Offline

Joined: Sat Oct 22, 2005 9:37 pm
Posts: 44
Location: Ypsilanti, Michigan U.S.A.
I've read some advice from a very reputable source stating that you can attach the paper using a spray adhesive and that doing so would act as a membrane, like you stated. He also stated it would allow more of the high frequencies to remain and keep the room alive.

I am paraphrasing of course. I must admit I'm torn between doing this and not.

_________________
Been playing guitar for over 30 years.
DAW: Recently switched from Pro-Tools to Reaper
I compose and record almost everything on my own.
Guitars are recorded direct via Axe-FX II.


Report this post
Top
 Profile  
 
PostPosted: Fri Mar 09, 2012 10:41 pm 
Offline
Senior Member
User avatar

Joined: Sat Mar 29, 2003 12:26 am
Posts: 2073
Location: Netherlands
Warrior wrote:
I've read some advice from a very reputable source stating that you can attach the paper using a spray adhesive and that doing so would act as a membrane, like you stated. He also stated it would allow more of the high frequencies to remain and keep the room alive.

I am paraphrasing of course. I must admit I'm torn between doing this and not.

I'm not sure you wanna call it a membrane. For a membrane to function it needs to be decoupled from the wool. That way it can vibrate on it's own in full effect. Without the wool suppressing the vibrations.

Adding any mass (be it paper, plastic or whatever) will act as a lowpass filter. Sure, paper has little mass so you can't really call it LOW pass :) But it'll filter some of the very high frequencies, sure.

I usually add a sheet of plastic in front of the wool to prevent high frq absorption. Since high frq will be easy absorbed by other stuff in the room you wanna "balance" your absorbers. Making a corner absorber doin' only low/mid end is a good start.


Report this post
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC + 10 hours


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB® Forum Software © phpBB Group