I use the 3M Peltor protectors that resemble the old Koss Pro 4A circumaural headphones that completely enclose the ears' pinnas. I have two dog kennels near me and I put up with all night barking, making sleep without sound blockers impossible. Dogs are quiet during the day, when they must...
If $11K is pocket change to you, then yes, it could be worth it if you believe that it is worth it and it fulfills your belief. Not so much for this chicken, though, bedawk!
Even if you could get signals with such over the top slew rate, the speakers would not be able to reproduce them and the ear would not be able to hear them in the event that the speaker could reproduce them.
I s'poze. In a way it sort of makes sense, because as long as a listener likes the sound, who cares how the device works-just so long as it sounds good, since that's all it's there for.
I did that for a living for awhile for the Milwaukee, WI City Forestry Dep't. MKE no longer has a forestry dep't and farms that work out to private companies now. Still have my rope & saddle and know how to tie the clutch knot at 78 years old, dag nabbit!
Did he ever replace those little walnut sized OPTs with some real ones in those cans? Either that, or was that photo showing the tiny transformers just a spoof, and those walnuts were never installed into any amplifier?
I think that with tube amps being such a niche item within a niche hobby (audio), in the grand scheme of things, little difference will be seen if tubes stay or disappear in terms of overall electrical consumption.
Rolloff rate below cutoff can show up the difference. A sealed box will roll off at a slower rate than a vented box design will once bottom of the frequency response range is reached.
My impression of ESL's is that flat ones are very beamy; step off to the side of one just a bit and the highs disappear. Curved ones may prevent that. I've never heard a curved ESL, so I don't experientially know.