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phase control

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redbook

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phase control
« on: 30 Sep 2009, 12:50 am »
Has anyone made use of the absolute phase feature on the bp25 and 26 preamps.? I  have seen Audio Research offers this as well. While I feel this is a good thing I have never yet found a recording that was in reverse mode( so to speak)...........redbook. : :dunno: 
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James Tanner

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Re: phase control
« Reply #1 on: 30 Sep 2009, 01:40 am »
Depending on whether the totality of your components 'invert phase' or not will determine if your in or out of absolute phase.

Typically you will hear it on transients. It is subtle at best.

If you want to maintain 'absolute phase' throughout your system then you have to know which components retain 'positive signal in' and 'positive signal out'. All Bryston components maintain absolute phase from input to output. The problem is that some components are designed with absolute phase in mind and some are not. So the chances are about 50-50 that one of your components or your software (CD DVD) etc. is not maintaining positive phase throughout the signal chain. With multi-mic recordings this is a tough thing to predict because specific instruments depending on the mic used and the signal chain can be different from another instrument in the same mix.

But hey here is another issue - the speakers themselves may not have all the drivers in phase with each other. It is very common to see the woofer moving forward when fed a positive signal and the tweeter or mid moving back.

james
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Gary Listen

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Re: phase control
« Reply #2 on: 30 Sep 2009, 04:18 pm »
James,

Does this "phase control" issue come into play with the wall outlets as well?  I use several circuits in my system.  I have read that circuits may be in reverse phase depending on the side of the panel they are pulled from.  My electrician said that my panel differed in that every other circuit was opposite phase as you go up and down the panel.  What are your thoughts about phase control when using several circuits in a single system?
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James Tanner

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Re: phase control
« Reply #3 on: 30 Sep 2009, 04:57 pm »
Quote from: Gary Listen on 30 Sep 2009, 04:18 pm
James,

Does this "phase control" issue come into play with the wall outlets as well?  I use several circuits in my system.  I have read that circuits may be in reverse phase depending on the side of the panel they are pulled from.  My electrician said that my panel differed in that every other circuit was opposite phase as you go up and down the panel.  What are your thoughts about phase control when using several circuits in a single system?

Hi Gary,

That ones over my head but I would think that your only concern would be from the Source forward as your only dealing with the audio signal not the power supply?

james
« Last Edit: 30 Sep 2009, 06:04 pm by James Tanner »
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brucek

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Re: phase control
« Reply #4 on: 30 Sep 2009, 06:22 pm »
Quote
My electrician said that my panel differed in that every other circuit was opposite phase as you go up and down the panel.  What are your thoughts about phase control when using several circuits in a single system?

All service panels are designed this way so that double breakers may be installed to realize a 220 volt circuit.

When installing dedicated circuits to your stereo or HT room, you always use breakers on the same leg so that the hot signals are in phase.

The result of using circuits that are on different legs is ground loop hum... (nothing to do with audio signal phasing)

brucek
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