Don Scott recently did a review on the ADA tuner. While it might not be the last word in tuner fidelity, it appears to be the best solution so far. Perhaps we'll get lucky and he"ll chime in!
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The optical output of the DT7000S sounds better than the analog -- gets rid of the 8-track sound. Untested, but told to me is that the optical output on any of the so-equipped portables is superior. The ADA tuner I reviewed for The Audiophile Voice was XM-equipped, but indications are that the Sirius audio would be excellent, but I can not swear that on a stack of tuners.