Mini-aechoic chamber - loudspeaker testing - diyAudio
Go Back   Home > Forums > Design & Build > Equipment & Tools
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Equipment & Tools From test equipment to hand tools

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
Thread Tools Search this Thread
Old 31st January 2015, 06:37 AM   #1
diyAudio Member
Join Date: May 2014
Default Mini-aechoic chamber - loudspeaker testing

Hi all,
I couldn't see a discussion on this topic in the forum already and I thought this part of the forum would be the best section to put it in so here goes.
I have an idea - purely formative at this point - of creating a reasonably sized anechoic chamber that would allow the tester to measure a speaker with a reasonable degree of accuracy in the near and far field in-situ. I know there will be some compromises over a full-blown outdoor measure (or a real test chamber for that matter) but I am thinking of a portable chamber comprised of 2 half cubes that when assembled might be 1 metre cubed. I got the idea from some websites selling transportable recording booths. It's a similar principle I believe. If you can make a sturdy structure that is finished in multiple layers of acoustic material then you could conceivably reduce reflections to a negligible level. For example, if you used an expanded aluminium sheet or perhaps a framework of acoustic fibreglass panels to form a shell then from than coat it in layers of acoustic foam then you might be able to get an NRC of a high value at low frequencies. Sonex for example posts graphs that show successively thicker layers of the material attenuating lower frequencies to a greater degree. I would think that a sensible limit might be around 250hz for the far-field attenuation goal. Nearfield could be done with 1 side of the cube in front of the speaker to limit direct reflections. I would suggest a small aperture to base of the cube to allow the mic stand to go through and another medium size aperture to allow the speaker stand to go through.
So, is this a dumb idea? Has it been thought of? I just thought I'd throw it out there to see what reaction I get.
  Reply With Quote
Old 1st February 2015, 05:09 PM   #2
diyAudio Member
Join Date: May 2008
Voice Coil - Voice Coil November 2014
  Reply With Quote


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
Accelerometer Testing of Loudspeaker Drivers gdan Equipment & Tools 31 6th April 2017 07:42 PM
Speaker testing without anechoic chamber deanxxx Multi-Way 21 19th May 2012 04:34 AM
Loudspeaker Testing Equipment bwhitejr Multi-Way 7 17th August 2007 06:50 PM
DIY Loudspeaker Testing Environment gregorx Multi-Way 14 13th July 2004 01:24 PM
Testing and Loudspeaker Design MarkMcK Multi-Way 0 1st September 2003 06:49 PM

New To Site? Need Help?

All times are GMT. The time now is 05:28 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2