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The SET "magic"

comes from a combination of low output power, 1-5% SECOND harmonic distortion only (upper harmonics greatly reduced), a damping factor turned to mush and an unstable frequency response into variable speaker impedances caused by the high output transformer impedance, and somewhat rolled-off "sweet" highs. As Bill F notes, some of these characteristics may be "emulated" in solid-state, especially Class-D designs with DSP.

They are really only suitable for driving extremely high-sensitivity speakers, which tend to have very low distortion of their own, and whose frequency response errors (such as shrill edgy treble) they may somewhat compensate for. Such SET/horn combos can in fact sound quite euphonic and lovely, to the point where many audiophiles prefer their presentation to a more "accurate" performance.

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