What would you buy Sub $350 Firewire/USB DAC

I'll bet you can tame that forward high end by running the DAC from an isolation transformer. Even a cheap one.

Dear Tobias--

Would you please elaborate for the ill-informed?

Thank you!

MP

An iso transformer would plug into your AC supply. Then you plug your DAC's power cord into the tranny. This eliminates much of the pollution on your DAC's AC line.

The transformer accepts 120V and puts out the same voltage. No actual transformation of voltage happens. However inside the tranny there is now a physical separation between the AC circuit in your wall and the AC line which feeds your DAC. Think of it as Customs and Immigration ( OK, Homeland Security if you're that way inclined ). The barrier is not enough to stop trade but it does stop the riffraff -- the grunge and pollution on the AC line. As a side effect, it also reduces most high-voltage spikes to harmless levels ( but nothing will stop direct lightning ).

The results for digital audio are pleasing to the ear, and one of them is cleaner highs. That's why I mentioned the possibility.

Isolation transformers are used in laboratories, hospitals, server farms and sound studios to keep AC line junk from affecting the working of delicate, precise, mission-critical instrumentation; oh, and sound recording gear. They are often replaced, sold off, upgraded and so on but they don't wear out and you can frequently find suitable ones used on eBay. You'd only need a little one for your DAC, say a 125 volt-amp size ( 125 VA or about one ampere ), but bigger wouldn't hurt if that's all you could find.

My brother runs studio gear with his computer and finds he gets cleaner sound with the iMac plugged into an iso tranny.

Thank you very much for the information--it is very helpful.

I am going to do a little research to see what is available in the budget range.

The dacMagic is continuing to mellow over time. I wonder how long a typical burn in takes....

Music_prof, what Tobias says omits a very simple face, at least IMHO, isolation transformers, indeed almost all ac filtering or conditioning devices, do more harm than they than good. There is one clear exception to this, again IMHO, the Synergistic Research PowerCell. It is not cheap, however. I have no recommendations that are cheap, except nothing.