Trevor Wilson wrote:
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https://www.rageaudio.com.au/index.php?p=1_12

Check out the dip at 15kHz.

** Very easy load for any sanely built amp.

Trouble for your nutty MEs - were they ??

**The ME850, with zero global NFB, a 2.5kVA power transformer, 245,000uF
and 70 Amps of continuous (till the mains fuse fails) current capacity?
None at all. Perfectly stable, regardless of load. A perfect match for
any ESL (or any other speaker, in fact). The ME1400 would do even
better, without raising a sweat (5kVA power transformer, 310,000uF and
100 Amps).


** You omitted the *very real* risk of damaging the input power limiter of a Quad ESL63 and any of its relatives.

But that speaker is not a problem load just because it dips at 15kHz.


....... Phil