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The TUK apparently isn't a neutral loudspeaker either. I'm thinking that Kanto, Klipsch, Paradigm, and PSB are all goosing the treble to dazzle showroom tire kickers, even though it's fatiguing for long term listening.
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This is really driver dependent along with room qualities of course (reflective surfaces). I had found our Axioms to be bright when i first got them compared to other speakers i had. Since then, i've owned (and still do) some Angstrom Legatos and they have a clarity that is yet to be surpassed (very quality Vifa tweeter). They can be fatiguing but the detail from that speaker never ceases to amaze me.