Not the kind of amp for these speaker, all ML ESL's have a very hard load for amps, here what Stereophile said about them in their measurements. I'll add they are also 1ohm in the highs
while the overall graph suggests a rating of 4 ohms rather than 6. The speaker drops to 3 ohms at 440Hz and to a hair over 2 at 24kHz, from which I infer that puny amplifiers, current-wise, should best be avoided. (Music has considerable energy at 440Hz, though only the occasional high-level cymbal crash will cause copious globs of HF current to be drawn from the amplifier.) MartinLogan claims a phase angle of 45° or less across the range; this graph confirms that to be the case, but the speaker's ability to shut down the KrellCheers George