Anyone ever use them? The latest evolution are the PA 4000 and 2000. I'd like to bi-amp my KEF Ref 2 and 100 centre speakers with my HK 5500 receiver. Not interested in bi wiring them, they need the power. Maybe the PA 2000 for the tweeters and the 5500 for the mid/bass? I think I saw some older generation HK power amps being sold off here a little while ago, but I can't remember who it was. Thanks for any ideas. By the way, the wife doesn't know about this latest ploy.