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Old 21st June 2004, 04:01 PM   #1
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Default Q: Stereo Amp / Dual PS Chokes

What is the reason behind separate R & L channel PS chokes off a single power trafo?

Is it that an individual LC-filter for each channel provides better isolation from the other than if the B+ came from a same point?

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Old 21st June 2004, 04:22 PM   #2
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Yup. What you describe is a pseudo-dual mono PSU.
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Old 21st June 2004, 05:13 PM   #3
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Quote:
Originally posted by Eli Duttman
Yup. What you describe is a pseudo-dual mono PSU.
Thanks Eli, one more -

Is it pseudo-beneficial or worth the extra effort?

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Old 21st June 2004, 05:49 PM   #4
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I don't see any point since you'll have a good amount of capacitance after the filtering, enough to anchor the supply that one won't cause any crosstalk to the other. On top of that, the signals are crossing far more in air and your head, who cares about -60dB crosstalk in the amp?

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Old 21st June 2004, 06:05 PM   #5
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A good number of people say things sound better when the 2 channels are isolated from each other, PSU wise.

JMO, it helps, but the benefits are relatively small. However, a lot drops of water combined make an ocean.
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Old 21st June 2004, 06:08 PM   #6
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Quote:
Originally posted by Sch3mat1c
I don't see any point since you'll have a good amount of capacitance after the filtering, enough to anchor the supply that one won't cause any crosstalk to the other. On top of that, the signals are crossing far more in air and your head, who cares about -60dB crosstalk in the amp?

Tim

Clearly , this is what my orientation has been. I keep hearing good things though from people not inclined to voodoo audio pronouncements. This may be one of those things I have to try then judge.

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Old 21st June 2004, 06:10 PM   #7
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Quote:
Originally posted by Eli Duttman
A good number of people say things sound better when the 2 channels are isolated from each other, PSU wise.

JMO, it helps, but the benefits are relatively small. However, a lot drops of water combined make an ocean.


This is what I keep hearing too.

Easy enough to try in any case & judge for myself.

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