Article: Reality Quest: Power and Digital Audio with the Sean Jacobs DC4 and Sound Application PGI TT-7 (Part 1 of 2)

[asdf1000]

6 hours ago, ray-dude said:

Ted, Rob is pretty clear that he thinks other power supplies are not only not helpful, but detrimental.

 

Actually Rob has not said this - he says other power supplies MAY be detrimental.

 

There is no way Rob has measured everything single power supply on earth, so there's no way he could make any claim about all other power supplies.

 

What he's said is that well designed SMPS's like he chose to use in DAVE  performed better (objectively) than linear PSU's he measured. He's said many linear PSU's have terrible RF filtering. SMPS's can have very good RF filtering.

 

So there are great SMPS's, there are great linear PSU's. And there are bad SMPS's (very high leakage current output for example) and there are badly performing linear PSU's (no RF filtering for example).

There's no way to generalise and Rob is careful about this. He only talks about what he's measured himself.

 

The only way to know is to measure the particular PSU in question.

 

 

[asdf1000]

17 hours ago, ecwl said:

I have often wondered how much of the sonic improvement is due to a switch from SMPS to LPS thus reducing high impedance leakage current coming from the PC

 

The way I read this , it reads like a switch from SMPS to LPS will result in reduction of leakage current...

 

But if you ask Mr Leakage @JohnSwenson - this is not a guarantee . 

 

There are SMPS's with more leakage than LPS and there are LPS with more leakage current than SMPS .

 

Can't generalise this stuff - can only measure the particular power supply in question.

 

Important note: I would never criticise or question anyone's subjective impressions here... that's not my style. I'm only talking in the objective domain