I have had used full range speaker with 300B SET amplifiers for 4 years.
But it had lot of limitation in treble.
After I switch to Lansche 4.1, I had been happy with pristine treble that I can not get with full range.
https://www.audiogon.com/listings/lis96gda-lansche-audio-no-3-floorstanding-speaker-like-new-reduce-...
This one is smaller model than mine.
But you can experience excellent treble out of plasma tweeter.
It will be very good for Jazz Vocal.
But it had lot of limitation in treble.
After I switch to Lansche 4.1, I had been happy with pristine treble that I can not get with full range.
https://www.audiogon.com/listings/lis96gda-lansche-audio-no-3-floorstanding-speaker-like-new-reduce-...
This one is smaller model than mine.
But you can experience excellent treble out of plasma tweeter.
It will be very good for Jazz Vocal.