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RE: Indeed, but it's driving only MR and treble into the 96dB-sensitive...

Posted by Caucasian Blackplate on July 4, 2019 at 12:12:48:
If the midrange and treble have large changes in impedance, the amps output will tend to follow those impedance changes more with fewer output tubes installed. Though this is most audible with low frequency drivers, it's not absent for most midranges and tweeters.