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While I am very cynical about any PS "protecting the unit from bad AC", I do think a PS can be "better" or "worse" in practical terms.  In other words, not all PS are created equal as they affect/effect Sound.  It may well be that my iDAT has a crappy PS, or at least it might be comparatively crappy with wall power.  However, here is one example (which proves the possibility...) where the "remaining" wimpy PS is perfectly fine when the unit is driven by a battery.  In this case, the guy who "created" this particular DAC actually did recommend battery power from the start, although the unit came with a wall wart, and I had to buy and rig up the battery, etc.  But what the Hell...  Adding that stuff at the factory would have tripled the unit cost, maybe more; but designing it for battery may have lowered the unit cost, in this case.

Best regards,
Paul S

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