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phasing
#401783 03/09/14 12:42 PM
Joined: Jan 2011
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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.

Re: phasing
J. B. #401790 03/09/14 07:39 PM
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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.

Last edited by casey01; 03/09/14 07:42 PM.
Re: phasing
J. B. #401798 03/09/14 10:04 PM
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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

Re: phasing
J. B. #401799 03/09/14 10:25 PM
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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. :-)

Re: phasing
J. B. #401800 03/09/14 10:35 PM
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Getting old & developing dim vision - I hear ya!!

TAM

Re: phasing
J. B. #401801 03/09/14 11:11 PM
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I hear ya, I am still looking for the truck that ran over me last time I was working behind my system.


DOG is GOD spelled backwards.
What others think of me is none of my business.
M80 V3 MY GLOSS Cherry
Re: phasing
J. B. #401808 03/10/14 01:45 AM
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Trust Audyssey smile


M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85


Re: phasing
J. B. #401814 03/10/14 02:15 AM
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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.


-----------------------------------

Enjoy the music, not the equipment.



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