If I may ask, the second had something special going on? Or all the differences between versions narrowed down to squashing software bugs etc. ?
According to Soo In:
"There are only two versions and you can tell by the speaker connectors. The first production lot with the Cardas speakers were sold out too soon than we initially expected, and there were certain components that were no longer available or required a thousand minimum order quantity. We’ve decided to update/upgrade from the second production that it will get 50% increase in power supply reserve, more optimized/faster input buffer design and better components (WBT connectors and Mundorf wirings). Compared to the first production unit, we and everyone we trust with good ears all prefer the second/current production version."
I assume software updates were also addressed and V2 came with the new remote control which is built like a tank as well as the vibration isolation stands as standard issue.
There was a proportional price hike from V1 to V2. Although both sound magnificent, V2 would have better results with speakers I would presume.
EDIT: There are actually three versions, V1 (SN XXX), V2 (SN AXXX), V3 (SN HXXX)
V1:
https://6moons.com/audioreview_articles/enleum-amp-23r/ (Srajens original review)
V2:
https://6moons.com/audioreview_articles/enleum-amp-23r-redux-2/ (translation from a German review website, not reviewed or written by Srajen)
V3:
https://6moons.com/audioreview_articles/enleum-amp-23-redux/ (written by Srajen who now goes from V1 to a V3, picture is of V2 not 3) &
https://6moons.com/audioreview_articles/enleum-amp-23r-3rd-opinion/ (by Frederic)
Differences between V1 and V3:
Totally different PCBs and updated software; both the forward PCB for control & power supply, and the rear amplifier board. Cardas speaker taps replaced with WBT taps. Gain auto return to mute function added. Updated chassis panels.
Differences between V2 and V3:
The left/right chassis panels have grooves in them, and the forward PCB is different (look at the bottom left corner behind the motor). No differences between the amplifier circuit (rear PCB), also according the 6moons the firmware was updated which makes sense as the MPU is located on the forward PCB.
V1 (SN XXX):
V2 (SN AXXX):
V3 (SN HXXX, this one is
H008):