Not as far as I know. The speaker taps seemed well matched to a number of speakers I used. Doubtless the importer, if there is still one in the US, could tell you.
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I previously owned one and I do not believe there are any adjustments internal for loudspeaker impedance either. My experience with the Solista was the same as David12 ... amp would drive anything I threw at it ... still probably the best sounding amp I ever owned. just could not deal with the heat from the 845's (plus my curious dogs and cats)