how can i figure out the resonant frequency of my room? - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software 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
Reply
 
Thread Tools Search this Thread
Old 16th May 2002, 08:16 AM   #1
diyAudio Member
 
Join Date: Apr 2002
Location: orange ca
Send a message via AIM to travis
Default how can i figure out the resonant frequency of my room?

i want to play whatever frequency it is through my guitar or a sine wave generator and make the walls shake and maybe break the sliding glass door.
__________________
donuts
  Reply With Quote
Old 16th May 2002, 01:48 PM   #2
Warp Engineer
On Holiday
 
AudioFreak's Avatar
 
Join Date: Oct 2001
Location: Queensland, Australia
It's very difficult to calculate and everything in the room will resonate at different frequencies. On a more serious note, serious structural damage can be done and unless you are doing this as part of a demolition i would not advise it.
  Reply With Quote
Old 16th May 2002, 04:24 PM   #3
diyAudio Member
 
kiwi_abroad's Avatar
 
Join Date: Sep 2001
Location: Wellington, New Zealand
Your best bet would be to get the sine wave generator (and some ear protection), hook it up to a decent amp and sub/ bass speaker and sweep the frequency untill you hear a peak, probably in the high teens or low hundreds of hertz.

Knock yourself out... I dare you
Adrian
  Reply With Quote
Old 16th May 2002, 09:07 PM   #4
diyAudio Member
 
Join Date: Sep 2001
Default resonant frequencies

I'm not sure how far you'll get, other than possible hearing damage. I know those car audio guys find the resonant frequency of their automobile interiors and go to 150-160db+ and still have their windows when its over. Maybe they actually modify/change their windows so they don't break? Which is another thing, you may need the resonant frequency of the glass door and not the room?
  Reply With Quote
Old 16th May 2002, 10:48 PM   #5
Apogee is offline Apogee  United States
diyAudio Member
 
Apogee's Avatar
 
Join Date: Feb 2002
Location: Tacoma, WA
Actually, you're most likely not going to need to get loud enough to experience hearing damage...

As posted above, get a tone generator and turn up the volume to moderately loud and slowly sweep the freq upward. You will hear the resonant freqs in the room because things will buzz and at certain freqs the system will seem much louder than at others... That having been said, keep in mind that the response of your ears is most likely not flat but you will be close...

Another option is to use a spectrum analyzer and white noise. This is how we used to tune rooms when I was doing pro sound work. The analyzer will clearly show you the peaks that the room is putting off and has the advantage of also showing you driver interaction as well as whole system interaction.

Lastly, be careful if using a tone generator with the volume too loud. Keep in mind that it's creating a continuous wave and as a result doesn't give the voicecoils in the drivers time to cool. If it's loud and you're sweeping low freqs the bass driver voicecoils will get very hot!!!! BE CAREFUL!!!! I needed a recone on an 18" driver once because I was testing at low freqs with a very large amp and got carried away... Please don't repeat my mistake!!!

This should get you close...

Good luck,

Steve
  Reply With Quote
Old 16th May 2002, 11:23 PM   #6
diyAudio Member
 
Join Date: Feb 2001
Location: Columbia, SC
The easiest way is to calculate the wavelength of the room--the length, that is--then place a speaker at one end. You can also go for half, quarter, etc. wavelengths.
Ezmeralda's point about the glass is a good one, though. The resonant frequency of the glass will be quite different fromo that of the room, and better damped, as well.
Not that I'm recommending that you collapse your eardrums in this manner.
There used to be a bass rig--the Acoustic 371--which had a small red and white warning label on the back of the cabinet saying that SPL within 10 feet of the cabinet could exceed 130dB. Naturally, I had to try it...
Looking back, I wish I hadn't...

Grey
  Reply With Quote
Old 17th May 2002, 07:08 AM   #7
diyAudio Member
 
Join Date: Apr 2002
Location: orange ca
Send a message via AIM to travis
cool
i have a tone generator on my computer.
__________________
donuts
  Reply With Quote
Old 17th May 2002, 07:12 AM   #8
diyAudio Member
 
Join Date: Apr 2002
Location: orange ca
Send a message via AIM to travis
can i explode my skull if i find it's resonant frequency?
__________________
donuts
  Reply With Quote
Old 17th May 2002, 07:16 AM   #9
Warp Engineer
On Holiday
 
AudioFreak's Avatar
 
Join Date: Oct 2001
Location: Queensland, Australia
Your internal organs will burst first causing fatal internal bleeding. This occurs somewhere between 2 and 5 Hertz.
  Reply With Quote
Old 17th May 2002, 07:17 AM   #10
BrianGT is offline BrianGT  United States
diyAudio Moderator Emeritus
 
BrianGT's Avatar
 
Join Date: Jan 2002
Location: near Atlanta, GA
Send a message via AIM to BrianGT
Quote:
Originally posted by travis
can i explode my skull if i find it's resonant frequency?
only if you are lucky.

--
Brian
  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
speakers operating near their resonant frequency kanguru007 Multi-Way 26 28th March 2009 03:02 PM
Ribbon Tweeter Resonant Frequency DamageG Planars & Exotics 2 14th February 2008 06:30 AM
Tweeter resonant frequency missing Dave Bullet Multi-Way 20 13th June 2007 11:02 AM
What about resonant frequency? Javachip Full Range 6 15th June 2006 07:12 AM
Resonant Frequency of an enclosure AudioFreak Multi-Way 9 4th July 2003 01:30 AM


New To Site? Need Help?

All times are GMT. The time now is 10:32 AM.


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