Used Benchmark DAC1
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I can appreciate that some of the less expensive DAC's listed above are good buys. However unless you can reduce the jitter you probably won't be happy with the sound quality. Take a look at the Benchmark DAC1 USB. It will reduce the jitter and the USB version has their best OP amps. Should cost $900-$950 used here on Agon.
There may be others as well, but the jitter reduction is worth the investment.
Paul is right - used USB version will not only guarantee later version without problems I mentioned before but also better op-amps in the output stage and therefore lower output impedance on balanced outputs. It just happen that best jumper setting for me is -10dB and I don't want to use it because of very high output impedance at this setting. Newer op-amps are stronger (LM4562) and divider is different. Also USB gives more flexibility.
With asynch USB the only jitter you have will come from clocking the data from the USB data buffer in the DAC "box" to the DAC chip itself. There is no clock recovery or clocking of data from the source to the DAC "box" similar to what's done with S/PDIF. Excellent white paper about all this on the Ayre site.
Straighten me out as needed everyone. My understanding is that jitter reduction methods in DACs and whatnot reduce or eliminate the jitter added in that component. If you get jittered data coming in from outside you cant do anything about it. If this is indeed correct that implies that you cannot added a separate device to reduce jitter.