Room modes: absortion, bass traps, Eq, speaker position... what really works? - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 6th February 2013, 11:33 PM   #1
diyAudio Member
 
Join Date: Nov 2012
Location: Brasil
Default Room modes: absortion, bass traps, Eq, speaker position... what really works?

my room is very small for a 15 inch speaker that I use, the 38Hz - 350Hz is really a problem because of the room modes interaction with the speaker, anyone solved this kind of problem with room treatment or eq? I would like to hear some...
  Reply With Quote
Old 6th February 2013, 11:55 PM   #2
diyAudio Member
 
Speedysteve7's Avatar
 
Join Date: Dec 2009
Location: Hants/Berkshire/Surrey
Have you measured it? Behringer mic + phantom power amp / Holmimpulse SW will do.

I use two Anti mode DSP units on my Tapped horns. I had 15dB peaks and troughs before at volume and DSP certainly fixed them up to acceptable +/-5 dB in room at listening position.
DSPeaker-Products
No connection with them other than satisfied customer.
The Anti mode I have is only good to 150Hz I think so meant for subs really.
SQ is good.
I believe they do a more comprehensive freq covering unit now. But that is a leap in cost and DSP the whole freq range.

I think proper bass traps would help too.
Something like the diagrams to be really effective.
RAM400-1000 Corner Bass TrapSound Acoustics

Depends how far you want to/can go.
  Reply With Quote
Old 7th February 2013, 10:02 AM   #3
diyAudio Member
 
StigErik's Avatar
 
Join Date: Feb 2008
You need to do all of it:
1. Start with speaker and listener position to get the best overall response
2. Add absortion and bass traps. You may be surprised to find that bass traps do not change the response all that much...
3. Fine-tune with EQ
__________________
dipoles dipoles dipoles dipoles dipoles dipoles dipoles dipoles and dipoles
  Reply With Quote
Old 7th February 2013, 10:24 AM   #4
lolo is offline lolo  France
diyAudio Member
 
lolo's Avatar
 
Join Date: May 2010
Location: somewhere by the border..
yep, it's a whole package.

Have you calculated the room modes already? I should start there.
  Reply With Quote
Old 7th February 2013, 10:27 AM   #5
palmas is offline palmas  Portugal
diyAudio Member
 
Join Date: Jun 2007
first you need to measure your room, acousticly or dimension.
Find out if you have modes (lets call it response peaks).
If so use tuned bass traps or ressonators to damp these frequencies.
Then use as much diffusers as possible. Try as wide range as possible, back wall, sealing, side walls and front wall.
No high frequency absortion should be needed (sound will go dead without some reflections).
The end result should be incredible.
  Reply With Quote
Old 7th February 2013, 10:37 AM   #6
diyAudio Member
 
Join Date: Feb 2008
Location: Enschede
Multiple subs, nearfield subs or a Double Bass Array (in a rectangular room) will all work very well without drastic acoustic treatment.
  Reply With Quote
Old 7th February 2013, 03:33 PM   #7
diyAudio Member
 
Join Date: May 2010
Location: MN
My experience so far has been that using 3+ subwoofers is far more effective than anything else with low modal frequencies. Room treatments can help higher frequency modes if there are any left. EQ is worthless for room modes.
  Reply With Quote
Old 7th February 2013, 04:11 PM   #8
AllenB is offline AllenB  Australia
diyAudio Member
 
Join Date: Oct 2008
Multiple subs would be a more complete solution but at the very least you could use one sub (could be smaller than 15"), covering your problem frequencies and working with the mains. Don't cross the mains, leave them as they are. Use the sub location, polarity and level to find an improvement.
  Reply With Quote
Old 7th February 2013, 04:22 PM   #9
diyAudio Member
 
1audiohack's Avatar
 
Join Date: Dec 2010
Location: Las Vegas Nevada
Quote:
Originally Posted by dumptruck View Post
EQ is worthless for room modes.
What?!?

That's swimming up stream but you're right.
  Reply With Quote
Old 7th February 2013, 08:37 PM   #10
Banned
 
Join Date: May 2008
Location: Switzerland
Quote:
Originally Posted by dumptruck View Post
EQ is worthless for room modes.
EQ can effectively deal with peaks (and dips to some extend) caused by room modes below about 100Hz.
Here're 3 articles worth reading: Bass Integration Guide – Part 1
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Simulating bass response with duct and speaker position ashok Multi-Way 15 17th August 2012 11:37 PM
Calling BudP - enabl vs room modes just a guy Full Range 14 26th August 2009 12:57 PM
Planar bass wave to take care of room modes ?? JinMTVT Subwoofers 12 4th October 2007 06:15 PM
DBA (dual bass arrays) and active bass traps capslock Subwoofers 3 20th August 2006 01:52 PM


New To Site? Need Help?

All times are GMT. The time now is 01:12 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2