Interesting and revolutionary conclusions and thinking there.
Did your tweeter burn out or is that your microphone ?
Tweeter is ancient, overdue for replacement, so it's getting some equally ancient but good Lomo units (horn type).
Again, another reason for splitting the system down into active crossovers and 3 amplifiers.
Once I get that running it will probably take several days mucking about with crossover values, levels, matching sound signatures & tracing back waveforms from microphones to get it close
It's all going off topic but interesting, all about designing stuff to achieve a given result.
My theory is a sound system should not have a deviation in frequency response across the scale of more than 3-4dB from 30hz-10khz, and as low distortion as possible from 30-80hz.
In reality it's almost impossible to achieve.
Peter Walker had ideas of his own.
I got part of my result using a full range driver, which I deliberately cut off at 1.5-2khz where they normally get horribly harsh. (eg. you can think of Lowther!).
Harsh speaker drivers+PP valve amps, you don't want to go there! I end up clapping my hands over my ears 
Quad ESL manage to get this amazing flat response except in the bass, where there is a huge lump below 80hz* which is likely to trigger the safety (arc) cutout if you have an amplifier that generates large power down there.
The room bass response remains weak on ESL because the reflection from the rear cancels out the front in most smaller rooms.
Later ones will still cut out with a powerful sound source, and the US Magnepan panels have weaknesses of their own.
The BBC used to use ESL until they made their own speakers.
Most UK, 50s and 60s recordings were made using them for mastering, so you have to have the right amp to drive them.
Below that* the drive impedance goes into the stratosphere (60ohm+). Distortion goes to pieces, then there's the weird behaviour at 10khz, and an almost dead short at 20khz!
Most decent large valve amplifiers will carry on regardless when presented with a near short from the safety system, and mine being repurposed industrial ones will carry on melting things down to 15hz or over 30khz, because they were designed to run shaker tables.
It's quite interesting sorting out hype from useful info.
There remains really only a handful of really competent people in the world working on valve amps, people like the US guy,
Tubelab, the Russian "
Wavebourn",
Gillespie,
Elliano... proper research - years of experience.
I guess we covered mostly everything on this topic now.
Gives me plenty to think about on my travels, and what to order when I can get around to it (including one of your kameleon to build in June, I hope).
I look forward to that as it's a great idea to take on my travels and demo to people.
