I have an excellent upsampler and dac (dCS Purcell/Delius) and am looking for the very best USB to PCM conversion. So far, I've tried SlimDevices Squeezebox, and Xitel Pro Hi-Fi link.
Both are very good, but I was wondering if there are any other options I should be considering. Both the Sutherland USB Preamp and the Wavelength USB Dac convert to analog. I'd like something of similar quality that stops short of the digital to analog conversion so that I can let the dCS gear do that.
There are various firewire based interfaces (Metric Halo, M-Audio and others), but I don't have direct experience with them. They tend to be geared to professional multi channel use. I've also seen PMCIA based interfaces.
I use an Apogee USB Mini-Dac with my Mac G4 laptop -- sounds really good for casual listening, using the laptop as a juke box. I rip my CD's to the hard drive uncompressed using AIFF. I had an M-Audio Audiophile USB Dac prior to the Apogee -- the Apogee blows it away. Of course the M-Audio cost $175 while the Apogee cost $976.
I'm using an M audio Firewire Audiophile. It sounds quite good, but it has some quirky volume problems. They are supposed to address this in a future firmware upgrade, but until they do that, I can not recommend it.
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