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Any *magic*? Anything 'missing'?
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I'm a dealer for... let's see... roughly a dozen different one-driver speakers (some high-efficiency cones and some full-range electrostats) from three different manufacturers, and OTL's work well with all of them. A single-driver full-range cone is usually an easy load to drive, and usually likes an amp with a fairly high output impedance (to flesh out the bass a bit), so OTL's tend to work very well there. Full-range electrostats typically have a much nastier impedance curve and lower efficiency, but a powerful OTL amp can sound absolutely wonderful on electrostats. In particular, the high impedance load that electrostats typically present in the bass region is a major problem for most amps, but OTL's aren't the least bit bothered by it.
I've used a Croft Troubadour with a pair of Moth Cicadas and I thought the sound was great.
My best system so far have been the Lamhorn 1.8 - Tenor Audio 15W OTL combo.Missing is the deep bass as the Lamhorn 1.8 have a rather low bass output. It won't do the cannon drill from the 1812 overture.
On the plus side is the uncanny ability of this combo to render "nuances" (for the lack of a better word).
Your question is much too general. A "one-driver" speaker can be anything from a full-range ESL panel to a Tannoy or Lowther driver. Also, not all OTLs are created equal for any one application. Perhaps if you provide some more detail you could get a more useful response. Most OTL amplifiers are at least somewhat sensitive to the input impedance of the speaker, the higher the better usually. Otherwise, there are no rules.
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