Originally Posted by jeffxx
The upgrade in DAC is too minimal
Well, let's just say that there are people who will claim there's a night & day difference between some DAC's. And others that will claim that there's really minimal differences if any after a certain point with DACs. It's your money, so you get to find out first hand.
Lots of devices have the same DAC chipset as much more expensive devices. The big differences is mainly components and the big one is power supply. The DAC of the STX/HD are actually quite good DAC's. You can get better components and a way better power supply of course. But I don't think a $400~700 DAC purchase is going to make a big impact for you. I think you would do well to side-grade to a stand-alone DAC, sure, but I can't help but think how the money you're about to spend on just a DAC could be money that puts you onto a flagship headphone that would make a much bigger impact on your listening experience, like an LCD2, HE500, T1, HD800, etc.
Ultimately I think if you're going to change DACs, I would start simple and see if it makes a difference for you. Like a JDS ODAC, Music Streamer II, Schiit Modi, TubeMagic D2, etc.