There is an excellent review of the 23R on 6moons from Frederic Beudot.
https://6moons.com/audioreview_articles/enleum-amp-23r-3rd-opinion/
He discusses how much trouble he's had finding the perfect amp to pair with his very finicky crossover-less, wide-band driver speakers (which are actually quite similar to a dynamic driver headphone in many ways). I think he really nails how wonderful sounding this amp truly is and how it surpassed the SQ of just about every other high-end, low powered amp (tube and SS) that he has tried.
https://6moons.com/audioreview_articles/enleum-amp-23r-3rd-opinion/
He discusses how much trouble he's had finding the perfect amp to pair with his very finicky crossover-less, wide-band driver speakers (which are actually quite similar to a dynamic driver headphone in many ways). I think he really nails how wonderful sounding this amp truly is and how it surpassed the SQ of just about every other high-end, low powered amp (tube and SS) that he has tried.