do i need a new DAC


i have a NAD D1050 which is now 5 years old but still sounds fantastic.  just upgraded my amp to the new Rega Brio 3.  was considering a Chord, Rega, or the new Audiolab MDAC+.  but i can't imagine it making much of a difference. for a DAC that is 5 years old the little NAD is holding up well?  what has happen in the last 5 years?  have their really been such great strides in digital playback made? i think SS is evolving faster.  any suggestions?
thanks,
128x128jag
Did the OP change out the power cord at least 3 times? How about the USB or SPDIF cable? Or the interconnects? 
If not, you have some work to do before you learn any DAC's limits.
A DAC not optimized is a shame.
i am using Rega interconnects, and the Supra coax cable. i went nuts with my last system and was buying $1200 interconnects, not going down that road again. pretty happy with a modest set up now.  it can easily get out of hand if you play the weakest link game. around and around we go.  i think what is being gained buy the new DSD format which really  supercharged pcm, is maybe greater dynamics. maybe not transparency?  have not heard it. may want one.  would like to hear from some forum members who upgraded from the NAD and to what?  and what was gained?
The FPGA design allows the incoming data stream to be sampled and reclocked. I owned the QuteEx and it was the most realistic and organic sounding dac that I've heard in its price range. And 5 years later, I'll bet the Qutest is at a much higher level than the EX.

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the Chord dealer where i live is only a Hugo and Mojo dealer, strange.  will have get on a plane. lol
OP seems to take a lot of potshots at DSD.  I listen to Classical and for me DSD has been the biggest innovation of the past 20 years.  MQA doesn’t do much for me, but there is another innovation that your current DAC doesn’t cover.
  So imo the answer to your original question is Yes— you need a new DAC