Which speakers did you find bright, fatiguing or just disappointing in some way?

wilson watt puppies w spectral amplification 

Wouldn’t it be nice to have a speaker you can turn right up and continue enjoying clean pristine treble?

Is there even such a thing?

yes, but not inexpensive...

The Cabasse Farella 401 speakers hit on all cylinders when paired with a quality SE or PP tube amp but hook a SS amp up to them and they would drive you from the room. Bright, fatiguing and light in the bass although the bass was always tuneful. Even pairing them with the class A SE SS Pass Labs Aleph 3 was a huge step in mitigating their bright signature but they are a real Jekyll and Hyde speaker if there ever was one

i agree with the statement above... one of my ventures into high efficiency speakers years back... don’t remember which model of cabasse... they were bright and otherwise grim and unruly

it is funny to see people get defensive when their brand of speaker is called out to not sound good to other folks

synergy and equipment matching is THE critical skill in this pursuit... some speakers innately play brighter and harsher than others... so then if one like what the speakers do otherwise, one finsd the right gear to minimize the deficiencies and accentuate the strengths... like most other pursuits it takes perseverance, knowledge, effort and $ to get it right