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In Reply to: RE: New Room Measurements posted by bhjazz on May 13, 2009 at 21:43:50
Base on personal experience, one of the reasons for the suckout is due to 2nd and 3rd Harmonic of 1L mode.
http://img.photobucket.com/albums/v241/joamonte/Small%20room%20bass/velodyne40hz.jpg
This is a 40Hz signal measured in a big and asmall room, notice the 2nd and 3rd harmonic at 80Hz ad 120Hz?
The root solution of this to reduce the 1st room mode at 31.5 Hz ,it will also reduce the 2nd Harmonic 63Hz and 3rd Harmonic 126Hz (I think the resolution of your graph is too coarse).....check out the other measurement I made before and after I make 2 huge Frequency-Adjustable Helmholtz resonators into a customer room, notice how the 31Hz 1L room mode reduced along with the 2nd 62Hz.
http://img.photobucket.com/albums/v241/joamonte/Small%20room%20bass/Koopanelbasstrap.jpg
Very interesting.
> > The root solution of this to reduce the 1st room mode at 31.5 Hz
The funny thing about it is this: that is (or is very close to)the tuning frequency of the port on my speakers! Oh no! Well, some serious room tuning is ahead!
I'll check out the graphs you posted tonight. Thanks!
here is another room..
Before.
http://img.photobucket.com/albums/v241/joamonte/Small%20room%20bass/1605090fr01.jpg
After reduce the 35Hz room mode.
http://img.photobucket.com/albums/v241/joamonte/Small%20room%20bass/1605090fr02.jpg
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