Opinions requested

Georgehifi, Funny you should mention Krell. Yes they were previously driven via a KAV-2250 which gave up the ghost therefor the Adcom now.

That Krell should have been special when it was working?
 
What about the Parasound Halo A21, similar to Krells power delivery, designed by John Curl. And from what I've read come with a very solid warranty plan and backup.

Cheers George   

I used that same amp with a Sonic Frontiers hybrid preamp and I thought it sounded pretty good.  I upgraded to Bel Canto Ref 500 monoblocks and a CJ classic preamp.  The Adcom/Sonic Frontiers sounded like a cheap a.m. radio by comparison.  I also used a CJ PV 10 and PV 12, they were excellent with these amps as well.  Both the CJ preamps and the Bel Canto amps can be acquired at very good prices used.    

The impedance is a simple value of ohms. The phase angle is a little more odd. The phase angle described how inductive or capacitive the load is. If you think of a full wave, the top and bottom of it together as a 360 degree shape, the phase angle describes where on the wave form, in degrees, the load becomes inductive or capacitive. It’s a measure of how reactive the load is. A negative phase angle describes a load that’s inductive. A positive phase angle describes a capacitive load. To describe it more literally, the impedance is the resistance the load poses to the voltage. The phase angle describes where on the wave form the load will draw or resist current flow. Low impedances with significant negative phase angle tend to draw more current than the impedance alone might suggest.

 Very good explanation but I believe you have it backwards. I thought that a capacitive load required more current to drive?  
 I'm not 100% on that though as the memory banks are a little foggy and I'm getting old LOL 

Contrary to popular opinion, I’ve heard 803ds sound amazing w high quality push pull tube amplification. Specifically, the Doshi-modified Lectron EL-34 amp. I think it puts out about 50-60 WPC. Maybe model 50.