Under $500 USB DAC's with DSD capability in DAC - Digital to Analog Conversion Posted April 30 Interesting comment on the D90. Thanks. (Similar to post 858 at HF Bifrost 2 thread.) I have a D50, had a D70, would not recommended either of those. Maybe the D90 will break in though, or could try a warmish i2s DDC such as Gustard U16, though need be real careful on compatibility. Having had a D70 and regular user of HQPlayer, I think it would be worthwhile to try some HQPlayer filters on the D90 in your big system.