I used Speltz autoformers for a while after I got Atma-Sphere MA-1 amps. With 8 ohm speakers (Abrahamsen, Aurum Cantus). I felt it introduced a slight veiling of the sound. I was much happier after I bought 16 ohm speakers (Audiokinesis Dream Makers). Even if the autoformers are good (they don't do much harm), I think that in order to get the best sound from OTL amps, matching speakers is the way to go.
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