Now you know what ear fatigue is.
Nothing to do with fatigue. It is immediate.
Reading back I sound contentious. Don't mean to be, so let me clarify.
When I want to listen loud, with Klipsch speakers, I turn them up but if I get them loud enough that they sound shrill, I immediately back off a skosh - or two - or three - until they no longer sound that way to me. So the effect is immediate, and the adjustment, too.
Now, my hearing rolls off between 10-12khz, and the slope steepens beyond 12. That may cause my shrill point to be at a higher SPL than yours. However, it is more like 2k-4k or so where I think the larger problem lies. Still, different listeners with have different levels where they find the sound objectionable.
Take fellow AKer
Tom Brennan - he can't listen to them at any level, and for more reasons than this one issue. Many folks feel that way about Klipsch, and have for fifty/sixty years, at least. He isn't alone. Others love them for a lifetime. Perhaps his hearing is more sensitive than mine. Perhaps he has different preferences based on his own listening experiences. He's no dummy, but a pretty smart cookie. I don't think he has to listen to them very long at all to decide he doesn't like the sound - I'm pretty sure it is immediate. This is what I've garnered over several years reading his posts, and forgive me if I got it wrong, Tom.
I can crank them up pretty good before I find the sound too objectionable, too shrill to enjoy. My maximum loudness for them may differ from others who enjoy the speaker, with some lower, some higher, some not at all, and perhaps a few oblivious who like them at eleven.
I simply don't find the need to pound my ear with them at levels I don't enjoy, and for me, again, it is an immediate response that takes no time to discern - thus I find the term fatigue a misnomer. Perhaps an inexperienced listener will take awhile to notice [edit - there are experienced listeners who also use the term - don't infer anything I didn't state here, please].
As I stated earlier, I like Heresies, but I have moved on. Generally, I think Klipsch are speakers that really require a good audition before purchase to discover whether they may be your cup of tea. The pair under consideration here have a lot going for them, with their exemplary condition and upgrades, and are well worth the listen, imo.
Am I right about all this? Maybe I have a couple valid points scattered here and there here and there, but I'm not often right about everything. It's simply my viewpoint. And in my view, calling it fatigue tells me more about the listener than it does the speaker.
Doubtless, there will be some here who disagree with my assessment. I've had my say, and responses are fine, but I'm not interested in debate.
If
bbqjoe auditions and buys them, chances are good he will really like what he hears, and if he decides to sell, keeping them in great condition, is likely to at least regain the expenditure, as well as learn something about his own preferences in the process.