Well, the D1 has fairly decent DAC's in it to begin with, that's why you paid the extra money over the AVM40 for to begin with. I've tried about a half dozen or so DAC's with my D2, including the DacMagic, Bel Conto DAC3, MHTD Labs Havana, MHTD Labs Paradesia, Benchmarkd DAC1 and the Musical Fidelity XDAC. The only way that you're going to know for sure is to listen for yourself.