Ken Kessler.

@rlj 

I think Ken Kessler may also have been having a shot at HiFi compared with the real sound of a piano!  I was walking round a hospital the other day and heard the unexpected sound of a piano, which to me was obviously a real one even though the sound was coming from corridors away.

Sure enough, it was real, not recorded.  I was surprised by how easily I could tell the difference 

@tabl10s 

Protection circuit kicked in(whew!). 

That's great!  What sort of circuit is it?

My Quad electrostatics (not the '57s) protect themselves by compressing signal voltages over 40-Volts, and 'clamping' (short-circuiting the amplifier) at 56-Volts.  

Most amplifiers shut themselves down when presented with a short circuit, and then power back up OK.  But I once tried a Luxman which sent a spike when switching on, which caused the speakers to clamp and the Luxman to power down.  Never did get them to work together ...

Richard,

It's was called APOC. Likely made of cheap components like the Xover's but good enough to keep the Adcom 565's from blowing them up. What it didn't do is stop the Classe 15/Bat VK-3 destroying a tweeter when my wife was showing off the system to her friend. 

Enjoyable. Thanks for posting.