Anyone With A Class 'D' Amp Play A 4 or 2 Ohm Speaker?

The OP has Infinity Kappa 9’s who’s impedance drops to

Bass
.8 ohm at 35hz
1 ohm at 40hz
2 ohm at 55hz
2.8 ohm at 60hz.

Upper mids lower highs
2.5 ohm at 2.5khz
1.2 ohm at 8.5khz.

All this and we haven’t even taken into account any negative phase angles yet, which will make these figures even more severe, pity there’s no graph on this.
.http://www.classicspeakerpages.net/IP.Board/uploads/monthly_2016_03/Kappa9Impedance.jpg.340a528e36b90ff2b94f383547346fb2.jpg

This is clearly a speaker that need bags of current for them to work at their best!!

https://forum.audiogon.com/discussions/help-power-pair-of-infinity-kappa-9-s-please

Cheers George 

Theta Prometheus monoblocks powering Wilson Maxx 3 speakers. Class D and no issues driving them.

Ralph, thank you for your excellent explanations, as always. My Martin Logans definitely sound more balanced in the top octaves when driven by my McIntosh MC2200 as compared to my other SS amp that doubles down with halving of the load impedance. I'm speculating that the autoformer design in many of the McIntosh amplifiers is why the Martin Logan pairing with McIntosh gear is very popular. I wonder if a pair of MC601s could be a good match for the OP's speakers.