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I don't have a system like this, but have designed a few power supplies.So since it's a laptop, why don't you just disconnect the charger whenplaying music? Any noise from the supply will go away.A lot of amp people do the same thing with external batteries.Keep in mind that laptops have internal power inverters (small switchers)that convert and regulate the battery voltages to what the laptopelectronics need, so some noise there anyway.You say Sound Card, so I assume no external DAC, so in that case runningon batteries will most likely produce cleaner audio of the "Sound Card".If you are using an external DAC, then power conditioning on the Laptop shouldnot have a lot of effect, unless it's so bad it contaminates system clocks orput disruptive noise into the logic (chips).This is all digital domain until it comes out of the DAC and hits the filters andamps post DAC. So to me it depends more on where the DAC is, Sound Cardor External DAC and where the DAC is needs the cleanest power.
I found this cheap USB - DAC cable (wireworld $20 click bottom right side photo) very close to sound as a much more expensive one.http://www.schiit.com/products/pyst-cables
I have an excellent external DAC (Bryston BDA-3), also the pre (SP2) and power (9B SST) Brystons and a Bluray Oppo 203.
WGH, ok, what happens is that I already have a reasonable USB cable (Mirage of DH Labs). It is somewhat cheaper than the Jmaxwell. At this moment, I think the weakest link is the electrical issue (Cable, Power supply, ... ???). Well, apart from wanting to change my speakers and subwoofer, which means entering another economic field. When I win the lotto, which I do not play.
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