In recent days, people are reporting some interesting findings on computeraudiophile.com. Specifically, these are people using the microRendu and comparing Roon RAAT mode with Roon/HQPlayer/NAA mode. There are some contradictory findings, so it could be that differences in sonic quality are system dependent. But it seems to me that the majority are finding that the Roon/HQPlayer/NAA mode sounds better than "straight" Roon, despite the apparent fact that both are sending bit perfect signals to the mR. Some people are concluding that this is not surprising because in both Roon/RAAT mode and Roon/HQPlayer/NAA mode, the mR is simply passing the signal through, and the actual playback is controlled by either Roon or HQPlayer. So different playback software sounds different through the mR. That's the theory, anyway.
I think what is most interesting to DAVE owners and owners of Chord dacs generally is that it may be possible to attain greater SQ by using HQPlayer as a pure playback engine without using its filters or any upsampling. Some users have reported that Roon/HQPlayer/NAA mode sounds clearly superior to Roon/RAAT mode
without using any of HQP's many special filters and DSD upsampling. One of those people is my friend Ken, who has compared the two modes with his Chord Mojo. See
http://www.computeraudiophile.com/showpost.php?p=547561. He just emailed to tell me that he has never heard better DSD than right now through his Mojo using HQPlayer in NAA mode with the microRendu.
Readers of this thread will know that Rob Watts has been adamant in taking the position that one should not perform any upsampling or filtering with his dacs because he believes that his own software/hardware will do these jobs better than any PC-based program. (“
Oh dear. Do NOT use your computer to up-sample or change the data when you use one of my DAC's.”) But if you are using HQPlayer simply to play recordings at their native sample rates, you are not running afoul of Rob's admonition.
Interestingly, my friend tells me that when he tried upsampling with HQPlayer to DSD256 on the Mojo (using HQPlayer's default setting), he preferred playback at the native sample rate. This would tend to confirm Rob's point above. But the caveat is that my friend hasn't really played around with different settings in HQP, so that conclusion is still premature.
In NAA mode on the microRendu, you still get all the benefits of Roon while using HQPlayer as the playback engine. For $145 for HQP, this could be a worthwhile investment.