Super chunk bass traps..... all corners? 2 corners? - Home Theater Forum and Systems - HomeTheaterShack.com

 
Thread Tools
post #1 of 9 Old 05-14-11, 09:00 PM Thread Starter
Elite Shackster
 
Zeitgeist's Avatar
Jim
 
Join Date: Apr 2009
Location: Ohio
Posts: 2,116
Super chunk bass traps..... all corners? 2 corners?

I know that there are a lot of recommendations on treating an entire room, such as first reflection points, front wall, rear wall, etc -- but I've found less information on bass traps. I've read at least one place "You can never have too many bass tarps"...

I'm building 1 7' tall "superchunk" 34" wide face bass trap (ala http://forum.studiotips.com/viewtopic.php?t=535) for one corner, but I was curious, ideally do you treat all 4 corners of the room?

As it stands now, I can't do triangle traps in the other 3 corners (one is a stair landing and one is near an equipment rack) -- but in a best case, do you want to treat them all? Or is it more important to focus on the walls rather than the corners? I believe that 2" works for broadband absorption, but 4" to 6" + is needed for LF absorption.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
Zeitgeist is offline  
Sponsored Links
Advertisement
 
post #2 of 9 Old 05-15-11, 09:57 AM
HTS Senior Moderator
 
bpape's Avatar
Bryan Pape
 
Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,288
Send a message via AIM to bpape Send a message via Skype™ to bpape
Re: Super chunk bass traps..... all corners? 2 corners?

Corners are an efficient place for bass control. That said, they are not a be-all, end-all solution to all of the bass issues. If you could post a sketch of your room, that would help.

Symmetry left to right in front of you is also very important.

Bryan

I am serious... and don't call me Shirley.

Bryan Pape
Lead Acoustician/Owner
Sensible Sound Solutions
bpape is offline  
post #3 of 9 Old 05-15-11, 02:07 PM Thread Starter
Elite Shackster
 
Zeitgeist's Avatar
Jim
 
Join Date: Apr 2009
Location: Ohio
Posts: 2,116
Re: Super chunk bass traps..... all corners? 2 corners?

Haha, I get frustrated looking at acoustics threads with no pics, and I'm totally guilty of it.

Please excuse my very crude sketchup drawing. I need to invest some time in it.

The frustrating thing about the room is that neither the front nor the room is symmetrical, so that makes things difficult. The stairs in the left take up a corner, and the closet (that has a water meter in it, otherwise I would have demoed it) in the right.
Attached Thumbnails
Super chunk bass traps..... all corners? 2 corners?-room.png  



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
Zeitgeist is offline  
 
post #4 of 9 Old 05-15-11, 04:56 PM
HTS Senior Moderator
 
bpape's Avatar
Bryan Pape
 
Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,288
Send a message via AIM to bpape Send a message via Skype™ to bpape
Re: Super chunk bass traps..... all corners? 2 corners?

Maybe we can get a bit createive...

How tall are the sub cabinets?

How much space between left wall and equipment rack?

Can we steal a little bit of wall space in the stair landing (don't know where things go in terms of stairs).

How tall is the ceiling? Can we do soffits? Still corners but lots of room and no floorspace taken up.

Just scheming.

Bryan

I am serious... and don't call me Shirley.

Bryan Pape
Lead Acoustician/Owner
Sensible Sound Solutions
bpape is offline  
post #5 of 9 Old 05-15-11, 07:47 PM Thread Starter
Elite Shackster
 
Zeitgeist's Avatar
Jim
 
Join Date: Apr 2009
Location: Ohio
Posts: 2,116
Re: Super chunk bass traps..... all corners? 2 corners?

Quote:
bpape wrote: View Post
How tall are the sub cabinets?
How much space between left wall and equipment rack?
Can we steal a little bit of wall space in the stair landing (don't know where things go in terms of stairs).
How tall is the ceiling? Can we do soffits? Still corners but lots of room and no floorspace taken up.
Sub cabs are 4', and that leaves 3' above it. Right now the screen is not AT, there is about 3' below the screen where the subs/speakers are with GOM fabric.

Right now I have some R13 on the back wall, which helps deaden the airspace that's empty - behind the screen. I put in R13 on the back wall behind the screen before I knew anything about fiberglass.

I'll have to measure the landing -- wall space would work. Right now I have 2 movie posters which I could easily move. What about two 2'x4' 4in thick OC703 panels on the wall near that corner, would that help at all? As an alternative to a triangular trap?

Ceiling is 7'. By soffit, do you mean something similar to this? http://www.asc-home-theater.com/products-soffit2.htm I've seen some soffits, that are only wood, with lighting above.. .but I'm not sure I understand how those benefit the room acoustically?


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
Zeitgeist is offline  
post #6 of 9 Old 05-16-11, 04:41 AM
HTS Senior Moderator
 
bpape's Avatar
Bryan Pape
 
Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,288
Send a message via AIM to bpape Send a message via Skype™ to bpape
Re: Super chunk bass traps..... all corners? 2 corners?

In the corners, 4" flat on the wall is better than nothing.

If the upper portion of the front wall (not the screen portion) is drywall, that should be removed and made just cloth and then we do both corners back there.

Yes on the soffits. What you do is just frame it, fill with insulation, and then cover in cloth (no drywall). Becomes one huge broadband bass absorber.

Bryan

I am serious... and don't call me Shirley.

Bryan Pape
Lead Acoustician/Owner
Sensible Sound Solutions
bpape is offline  
post #7 of 9 Old 05-16-11, 09:07 AM Thread Starter
Elite Shackster
 
Zeitgeist's Avatar
Jim
 
Join Date: Apr 2009
Location: Ohio
Posts: 2,116
Re: Super chunk bass traps..... all corners? 2 corners?

Hmm. You've given me some food for thought. I'm going to go to an AT screen at some point too, so then that would open things up a little more too.

I like the soffits idea, but I think the WAF would probably kill it..

At some point I know I'll move... and a priority for me is a room more suited for theater.

Is 2" good for first reflections?

I seem to recall someone saying that 1" is somewhat ineffective except for covering large areas for the purpose of broadband absorption.

Thanks for your help


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
Zeitgeist is offline  
post #8 of 9 Old 05-16-11, 09:13 AM
HTS Senior Moderator
 
bpape's Avatar
Bryan Pape
 
Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,288
Send a message via AIM to bpape Send a message via Skype™ to bpape
Re: Super chunk bass traps..... all corners? 2 corners?

1" will tend to skew the amount of high frequency vs mid/low frequency absorption if too much is done. 2" is usually OK unless you have the speakers really close to a side wall, then the first one you'd want to be more like 4"

If WAF is an issue, you can make the soffits say 12" wide but only 6" tall so they're not so obtrusive yet can still be very effective.

Bryan

I am serious... and don't call me Shirley.

Bryan Pape
Lead Acoustician/Owner
Sensible Sound Solutions
bpape is offline  
post #9 of 9 Old 05-16-11, 09:41 AM Thread Starter
Elite Shackster
 
Zeitgeist's Avatar
Jim
 
Join Date: Apr 2009
Location: Ohio
Posts: 2,116
Re: Super chunk bass traps..... all corners? 2 corners?

Cool, thanks for your help Bryan!


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
Zeitgeist is offline  
Reply

Bookmarks

Tags
bass , chunk , corners , super , traps

Quick Reply
Message:
Options

Register Now




PLEASE COMPLETE ALL REQUIRED FIELDS BELOW... THANKS!

REQUIRED FIELDS ON THIS PAGE
YOU MUST COMPLETE ALL OF THESE

Username
Password
Confirm Password
Email Address
Confirm Email Address
Random Question
Random Question #2




User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
PLEASE READ BELOW PRIOR TO ENTERING AN EMAIL ADDRESS!

ATTENTION!

YOU MUST ACTIVATE YOUR ACCOUNT!

Activation requires you reply to an email we will send you after you register... if you do not reply to this email, you will not be able to view certain areas of the forum or certain images... nor will you be able download software.

AN INVALID EMAIL ADDRESS WILL CAUSE YOUR ACCOUNT TO BE DELETED!

See our banned email list here: Banned Email List

We DO NOT respond to spamcop, boxtrapper and spamblocker emails... please add @hometheatershack DOT com to your whitelist prior to registering or you will get nowhere on your registration.


Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML is not allowed!
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


For the best viewing experience please update your browser to Google Chrome