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Meridian and ATC have been making active speakers for several decades. This is a whole level above simply making your own amps. It means each transducer has a dedicated amplifier specifically designed for it and the transducer is specifically designed for the amplifier. This approach addresses a huge amount of inadequacies and issues with traditional passive designs.
(not counting sound-bars, nor mini speakers set like Bose / B&O)
No longer active in making both:
Sansui (some of them are really nice)
Einstein (prototypes only thru Odeon)
Conrad Johnson (prototypes only?)
Red Rose Music (defunct)
The already-mentioned Music Reference is unique in that the company offers an ESL loudspeaker/dedicated OTL tube amp combination. Not only is the amp output transformer-free (hence the OTL designation), the ESL is stepup transformer-free; the amps' output tubes are connected directly to the ESL drivers! Designer Roger Modjeski created a similar design when he worked for Harold Beveridge.
Not yet mentioned is Sanders Sound Systems, who make a fantastic ESL loudspeaker and a solid state power amp designed specifically for ESL's. A second version of the amp is optimized for magnetic-planar loudspeakers (Magnepan, Eminent Technology).