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#401783 - 03/09/14 08:42 AM phasing
J. B. Offline
connoisseur

Registered: 01/19/11
Posts: 1271
Loc: Quebec, Canada
a few days ago i installed a new amp for my 2 front speakers.

when the installation was finished, i realized that the speakers were not
in phase, so i inverted the connecting wires at one of the speakers' connector.

all was fine until the time came for Audyssey calibration.
Audyssey said my front speakers were out of phase. i ignored the advice and went on with the calibration, knowing they were in phase.

what i would like to know is the reason this is happening; that Audyssey says one thing and my ears tell otherwise.
could it be that phase is inverted in the amplifier?
the amp is bridgeable, and i think that when an amp is bridged, one of the channels' phase is inverted; but the amp, as used, is not bridged.
it's used in stereo mode, and the only filter used is a 33Hz hi-pass.

anyone can enlighten me about this? i find it quite puzzling.
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#401790 - 03/09/14 03:39 PM Re: phasing [Re: J. B.]
casey01 Offline
aficionado

Registered: 07/03/08
Posts: 768
Loc: Toronto
Originally Posted By: J. B.
a few days ago i installed a new amp for my 2 front speakers.

when the installation was finished, i realized that the speakers were not
in phase, so i inverted the connecting wires at one of the speakers' connector.

all was fine until the time came for Audyssey calibration.
Audyssey said my front speakers were out of phase. i ignored the advice and went on with the calibration, knowing they were in phase.

what i would like to know is the reason this is happening; that Audyssey says one thing and my ears tell otherwise.
could it be that phase is inverted in the amplifier?
the amp is bridgeable, and i think that when an amp is bridged, one of the channels' phase is inverted; but the amp, as used, is not bridged.
it's used in stereo mode, and the only filter used is a 33Hz hi-pass.

anyone can enlighten me about this? i find it quite puzzling.


That is why I am not a particular fan of calibration. A few months ago I bought a brand new Yamaha CX-A5000 Pre-pro, great unit, however, when I did the calibration, it read that all but 1 pair of speakers(9.2)were out of phase which is ridiculous. It had me rechecking everything in my set-up including the cabling between the Pre-pro and amps, but, in the end, being pretty meticulous when I connected the new unit, and I hadn't changed any connections between the amps and speakers anyway, I knew there was nothing wrong.

My usual checking method(if you want to be 100% sure) is run a test tone just in the L/R speakers and when sitting in the sweet spot between the two and the tone is in the middle then you know everything is OK.


Edited by casey01 (03/09/14 03:42 PM)

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#401798 - 03/09/14 06:04 PM Re: phasing [Re: J. B.]
exlabdriver Offline
connoisseur

Registered: 09/07/11
Posts: 1027
Audyssey found that my 'Rears' were out of phase with the other speakers & indeed they were hooked up wrong on Axiom's powered wall mounts.

My fault, but Audyssey was correct in that case...

TAM

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#401799 - 03/09/14 06:25 PM Re: phasing [Re: J. B.]
J. B. Offline
connoisseur

Registered: 01/19/11
Posts: 1271
Loc: Quebec, Canada
i checked my wiring again, and found out that everything was ok before i did the calibration.

i'm getting quite old, and after about 8 hours work on the new setup, i was very tired and out of breath and a mistake slipped by which i did not see when i checked all the connections again just to be sure all was right.
i had also checked on a TV station where the sound was mono...

so now everything is fine and working properly; i just had to reverse a connection on one of the speakers.

so, we just forget about this and go listen to some good music...

thanks to you both for the comments and help. :-)
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#401800 - 03/09/14 06:35 PM Re: phasing [Re: J. B.]
exlabdriver Offline
connoisseur

Registered: 09/07/11
Posts: 1027
Getting old & developing dim vision - I hear ya!!

TAM

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#401801 - 03/09/14 07:11 PM Re: phasing [Re: J. B.]
Socketman Offline
connoisseur

Registered: 07/12/09
Posts: 1190
Loc: Whitehorse YT
I hear ya, I am still looking for the truck that ran over me last time I was working behind my system.
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DOG is GOD spelled backwards.
I blame my terseness on my keyboard. smile

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#401808 - 03/09/14 09:45 PM Re: phasing [Re: J. B.]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13337
Loc: Iowa
Trust Audyssey smile
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M22-OWM22-VP100-Denon2805
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#401814 - 03/09/14 10:15 PM Re: phasing [Re: J. B.]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10395
Okay Jacques, but just to answer something you asked about, yes some amplifiers do invert polarity, but this would affect all its channels equally, so the connected speakers wouldn't exhibit a wrong polarity issue.

Of course some "audiophiles" imagine that absolute polarity is also necessary, but testing doesn't support such a theory. It isn't unusual for polarity to be reversed several times in the electronics of recording studios.
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