It's about amp/speaker synergy. I find the LM SET amps sound best with a flat, higher impedance load speaker. My LM805ia sounds way better through my 10 ohm DeVores compared to using my Cary SLI-80HS through the same speakers. Conversely the Cary amp sounds much better paired with my Klipsch Forte III's than they do when paired with the DeVores.
Personally I suspect those Acoustic Zen speakers will not coax the full potential out of the LM amp and in fact they may sound better through your Prima Luna.
Personally I suspect those Acoustic Zen speakers will not coax the full potential out of the LM amp and in fact they may sound better through your Prima Luna.