I know nothing of rendu, I use a desktop music server
Can I ramble
This isn't directed at you Whazzzup, it's just something I wanted to write down.
Do you use a SOtM or jCAT USB card in your music server? You get a huge gain from using one. Then you get another one if you power it cleanly. If you power your motherboard with a good PSU, its even more of a gain then powering the USB card cleanly. I did all kinds of tests. There is a big "BUT" here though. Everything else has to be good. Sound like the rest of your system is up to speed. I did have some kind of cheap Furman and it killed my 2 channel system. Bet a good linear one rocks. I love my Audience and my cousin has good luck with the new AudioQuest Niagra. I like to have clean 0s and 1s to start with. Those dirty PC motherboards will kill your sound. If you don't think clean 0s and 1s matter, just try hooking up a Dell Mini 9. It's a small fanless, 10/100, can't keep up with DSD but... sounds terrible as a media server. Removing the SOtM tX-USBexp in my CAPs server and moving to a microRendu was huge! Just read some of the reviews. It just further isolates RMI/RFI distortion because these little devices with their proprietary mother boards and USB configuration are built for good 2 channel audio. We are talking Aurender level without the cost and from what I've read, even more so with the ultraRendu. All my CAPs server is doing now is sending DLNA to the microRendu for further isolation. A good PSU is also important on the microRendu. I think quality goes like this from worse to best:
Dell Mini 9 > USB > DAC
A PC > USB > DAC
Power Conditioner > A PC > USB > DAC
Power Conditioner > A MacBook/Mac Mini > USB > DAC (Think Macs just have cleaner motherboard at this point)
Power Conditioner > A PC > USB > JitterBug or similar device > DAC (still not starting with the cleanest 0s and 1s)
Power Conditioner > A MacBook/Mac Mini > USB > JitterBug or similar device > DAC
Power Conditioner > A PC Audiophile computer > SOtM/jCAT > USB > DAC (this is where better power cables start making a difference)
Power Conditioner > A PC Audiophile computer good PSU > SOtM/jCAT > USB > DAC (huge gain here!)
Power Conditioner > A PC Audiophile computer good PSU > SOtM/jCAT with good PSU > USB > DAC (not as big of a gain)
Power Conditioner > A PC Audiophile computer good PSU > DLNA > microRendu with iFi PSU > USB > DAC (big step!)
Power Conditioner > A PC Audiophile computer good PSU > DLNA > microRendu with iFi PSU > with even better USB > DAC
Power Conditioner > A PC Audiophile computer good PSU > DLNA > microRendu with even better PSU > USB > DAC
Power Conditioner > A PC Audiophile computer good PSU > DLNA > microRendu with even better PSU > with even better USB > DAC
Power Conditioner > A PC Audiophile computer good PSU > DLNA > ultraRendu with even better PSU > with even better USB > DAC
If you don't have this worked out, I feel like you might not even be hearing the full potential of you system/dac.
Guess I should get back to work.