I agree with Paulinko and prefer passive artikulates with solos. Having owned aktiv isobariks and keltiks, i am familiar to what aktiv offers. Having heard 242s in various configurations, definitely do not prefer 4100 aktiv to klimax passive. The question active vs. passive has been discussed on all...

I am surprised you did not prefer a 5103 to kairn pro, was the phase inverted when you changed, this can make a difference.

Hi I have installed at least 10 pairs of artikulates, 3 pairs passive, the side wall has varied due to room layouts, toe in normally 5 deg and distance to rear wall between 22cm and 30cm never more.