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The importance of a good power supply?

Hi guys, just got the new Dell. It's only so far come out of the box to get sound card and software installed at the music store.

Anyway, before I go plugging it into my wall, is it important to get a good power bar, or some such device that helps control power spikes, or is it all a moot point as the machine converts it into 24V DC anyway?

Mic Power supply's a hummin-OK to use a ground lift adapter?

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So there's one and only one thing in the studio here that introduces ground hum.

A power supply for a tube mic.

Everything's on one isolated circuit BTW.

A 3 to 2 prong ground lift adapter will silence this nutty piece o' hummin gear, but is it safe? (This mic will be used for a D/I'd electric guitarist who will be simulaneously playing and singing).