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Old Yesterday, 11:03 PM   #1
diyAudio Member
Join Date: May 2014
Default 180 degree phase shifts

Hi I have Spectra 22's and when doing my room EQ found that both the left and right units exhibited 180 phase shifts at certain frequencies. How can this be corrected?
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Old Today, 12:22 AM   #2
tyu is offline tyu  United States
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Join Date: Jul 2009
Here what we got.....I have the Specstra 3s......I run them fullrang..I don't care for the Spectra sound.......cant wate for more input on this.....
look like...sounds like....well to me.....there is some shift....
here the setup of the panels.....pic 3 is one panel....so you have 2 in ea speaker.....so that's setup to like 4 panels ea...with..4 front 4 back...but only 2 mylars.............nut right

Last edited by tyu; Today at 12:36 AM.
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Old Today, 03:25 AM   #3
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Join Date: Jun 2005
Location: Fort Worth, Texas
Originally Posted by stevetennant View Post
Hi I have Spectra 22's and when doing my room EQ found that both the left and right units exhibited 180 phase shifts at certain frequencies.
Can you post the measurement and/or give some more details?
1) How were the speaker and mic positioned in the room?
2) From your description the phase shift was localized at a few narrow frequency bands, not several octaves, correct?
3) High frequency? Low frequency?
4) Did the phase reversal coincide with a dip or peak in the response?
5) Same or different between the speakers?

Remember since they are dipole speakers, the sound coming from the backside of the diaphragm is 180deg out of phase with the front, so depending on proximity to rear and sidewalls can get some localized cancelling and phase reversals. It may also be related to room modes being excited in a different manner than with a monopole box speaker.
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