I have been doing a lot of reading concerning why people use a USB-S/PDIF converter in line between the USB connection between a computer and a DAC which I guess is due to the clock speed, jitter, and timing issues. I know very LITTLE about these issues.
My current set up is the following: Macbook - USB cable in - Resonessence Labs Concero HD - RCA connectors out - Burson Soloist in via the pre-amp - headphones (Audeze LCD-3)
Mark Mallinson at Resonessence Labs has been quoted the following:
"We spent a lot of time making sure that speed differences between the host PC’s reference clock and the high quality low phase noise reference of the CONCERO (and INVICTA) didn’t cause issues. The async code needs to be able to handle when the host PC is both too fast and too slow. We made the CONCERO and INVICTA code work for up to +-4000ppm. To allow for this large difference we needed a custom solution with larger data buffers. Having these buffers also makes our solution less likely to dropout when there are other USB devices connected to the host PC.”, says RL mainman Mark Mallinson."
Based on this statement, it sounds like RL did a good job with USB implementation such that it sounds like I would not need a USB-S/PDIF converter between my Macbook pro and my Resonessence Labs Concero HD. Does that sound correct?
Also, would a USB power supply unit (PSU) (like the iFi iUSBPower Power Supply) be something to consider placing in line between the Macbook and the RL Concero HD ? I guess this would provide external power to the USB connection and thus improve the SQ?
Thanks so much
PS. Is anyone using a USB-S/PDIF converter between their computer and the Concero HD? If so why?