I own an original Border Patrol SE. I talked to Gary Dews about the upgraded model. He said it sounded more organic and less hi fi. I’d also like to know if anyone has heard the upgraded version.
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I've got the SEi version. It was upgraded by Gary from the original. The difference in the sound is as Gary states: it's warmer and even more natural-sounding. After listening for a while my feeling was that the cap upgrades got the sound closer to what I hear from vinyl playback. Not as good but definitely in the same neighborhood. An absolutely worthwhile upgrade. Gary doesn't disappoint. No drama, no nonsense. Just great service and honesty.
Gary's response to my question about different capacitors:
DAC SE 2017- March 2019 has Uptone Audio polypropylene caps.
DAC SE from March 2019 to May 2019 has Jensen paper in oil.
DAC SE-i from May 2019-December 2019 has Jensen.
DAC SE-i 2020 has Jupiter.
The Uptone/Jensen time windows are approximate. There was some overlap depending on availability.
So it looks like DAC SE-i can have Jensen caps or Jupiter caps, depending when a DAC was made.