I say aktiv, but have never tune demed aktiv LK amps to Klouts. I have aktiv LK140s and am thrilled with them. Here is an interesting article to help decide. After reading this, I decided to stay aktiv instead of upgrading to one passive 2250.
http://www.hometheaterhifi.com/volume_9_4/feature-article-active-speakers-12-2002.html
Tim
http://www.hometheaterhifi.com/volume_9_4/feature-article-active-speakers-12-2002.html
Tim