And to complicate matters a little bit with what will likely be a footnote to the discussion, it should be mentioned that output transformerless (OTL) amps actually increase their output power into higher impedance speakers. Atma-sphere amps are the most well-known OTL amps although there are also OTLs from Tenor, Transcendent (incl kits) and others.
This makes Speltz autoformers particularly helpful with these OTL amps, although as the Speltz site testimony makes clear the autoformers can improve sounds with other amps as well.
This makes Speltz autoformers particularly helpful with these OTL amps, although as the Speltz site testimony makes clear the autoformers can improve sounds with other amps as well.