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RE: I have an idea...

I think the reason that what you describe is never done with an OTC amplifier is probably because of the high voltages involved. The speaker wires would have to carry thousands of volts in most cases, which is both unsafe and unwise. But I think Dave Slagle has implemented something like this with Quad 57 ESLs and one of his amplifier designs, where he has eliminated the step-up transformer at the input to the Quad in favor of a single transformer that effectively mates the amplifier to the Quad stators, directly. This is not direct-drive; there IS a transformer at the amp/speaker interface, except where you would usually have two transformers, now there is one. I heard this set-up at the Capitol Audio Fest, using stacked pairs of ESL 57s. The speakers are owned by a local friend. At home, he uses three panels per side. Quite impressive.

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