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 

Ralph, since since the 70’s I have had nothing but mostly ESL’s, Stax F81, F83, Acoustat 2, 6, 2+2, 1, 1+1, Martin Logan CLS, Monolith, Monolith III.

Tube amps I’ve had Triode, Ultra Linear, Pentode, Tetrode, SE, Paralleled SE, massive Push/Pull, some built by me some not, but heavily modded.

Nothing drives these ESL’s as well as a good bi-polar solid state with good current ability, period sorry.

And please don't start with the Zero stuff on OTL's 

Cheers George

When a good solid state amp with good current ability, drives a wild impedance curve, like many esl’s have, and speakers like Wilsons have, it will stay close to flat across the frequency range, giving least colouration.

Where a many a tube amp and some mosfets will start to behave like a tone control giving a far from flat frequency response, giving more colouration to the sound.

This is why with Martin Logan ESL as I have, which go down to 1ohm in the high frequencies can sound recessed in the highs with tubes, but with good solid state with good current drive the high are better defined not recessed and extended. Same applies to the bass if low in impedance.

This is proved many times by Stereophile’s amplifier tests into simulated speaker load conditions.

Cheers George