Burn In on Aurender N100H


I just acquired an Aurender N100H.  It replaces a Sonos Connect modified by Wyrd4Sound.  After installation, I noticed a very "digital" sound and a lot more noise than I'd been familiar with while listening to the modded Connect.  The modded Connect was connected to my Schiit Audio Gumby via Digital Coax.  Aurender can only connect via USB.
How long do I need to burn this in to get a sense of the quality of the Aurender?  I have a 60-day return policy and if this unit doesn't improve exponentially it is going back.  I would appreciate hearing from anyone with a similar experience and how things worked out.
Also, any advice on the best USB cable for the connection between the Aurender and Gumby?
Thanks
128x128pg62
I just acquired a 220v N100h cheap.  Anyone out there willing to take a pic of the internal connections to the transformer. It’s a dual core transformer so I’m looking to convert it to 115v. Just need to see the connection. Thanks in advance. 
Really appreciate this thread. I just purchased an aurender n100h to pair with my hegel hd30 dac. The dealer loaned me a few step-up cables but so far none sound satisfying. The ansuz x usb is warm and round but dry with no air and grayish background. The worldwide silverlight is very different... tonally colorful and detailed but a glaring top end and very flat Soundstage with no depth. If these were my only two sonic options the aurender would be going back. But I'm crossing my fingers that the curious cable can bring a much needed analog smoothness with some air and 3 dimensional soundstaging. I don't need pefection, but I don't want to lose what I remember from my old transport and audio alchemy dac combo either. The curious cable is ordered! I'll report my results once here...
fm540i,
can you help me changing the voltage of the N100H to 115v ? thanks so much.