This is just IMHO but after updating my DAC 2X to the new version 2 I feel it is a significant upgrade although expensive. My observations are better vocals both male and female. There also seems to be
be more weight to the music and improved but subtle detail. I posted this as an insight for other DAC 2x
owners who maybe considering this upgrade.

Ag insider logo xs@2xtomr1

I understand it has been a few years since this thread. I just stumbled across it when researching what is the latest firmware upgrade for this DAC. I also own the EMM Labs DAC2X V2 Dac. I sold my Playback Designs MPS-5 DAC to purchase the EMM Labs after listening to my friends EMM Labs DAC. He loaned it to me for about a week and I was able to do a comprehensive A/B comparison between the EMM Labs DAC2X (prior to the V2) and my PBD MPS-5. The PBD I had had for a few years and I still think it is a brilliant DAC but after having listened to many many DACs to compare to my MPS-5 the EMM Labs was the first DAC that I listened to for a lot longer before wanting or felt like i needed to swtich back to my MPS-5 and then become the only DAC where I found myself wanting to switch back too. Which to my ears meant there was something I found more appealing about the EMM Labs DAC over my PBD MPS-5 one. I also bought the EMM Labs TSDX Transport as the PBD MPS-5 unit had its own Transport. 

I really wish I could give you an opinion on your questions. But I
have no experience with Uptone audio. I also don't know if the EMM
labs  new galvanic isolation is the reason for the improved sound,all
I know is the upgrade has made a substantial improvement in sound

I own 2 CD transports and thousands of CDs so always interested in redbook sound quality from any DAC.
I have dac2x and am considering to upgrade to v2.
tomr1, what source you are using with dac2x? computer or network stream server?
I use aurender N100 with dac2x and wonder how much difference the v2 usb galvanic isolation  will add? 

Does adding a Uptone ISO usb also improve sound ?
I am the guy who started this discussion and my response to glory
is I have tried several other high end DACS including the Bricasti SE,
the Berkeley Audio Reference MK1 the MSB Analog and the Linn
Klimax and IMHO it is the best of them more musical.
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I have a 2012 DAC2X which was just updated to V.2 (DAC2X V2) at the company without any problems or special charge because of its age. The upgrade is well worth it. It took an excellent DAC and made it significantly better.
If you decide to buy a used DAC 2X make sure it was manufactured
in 2016 or later as their were improvements made that you will need in order to do the Version 2 upgrade.
@tomr1 Are you using the USB input? If so, its supposed to be much improved on this new version.  I'm considering a used DAC 2X and would eventually upgrade to the V2 if I decide to go this route.