i'm NOT assuming anything here :-) & I think Onhwy61 & Timf are on the correct path:- Vertigo, what's your definition of listener's fatigue? & what symptoms are your experiencing? The suggestions depend on your answer.
(I did own the B&W DM604S2 for 3 yrs & I know that they are not very discriminating speakers compared to the N-series. Never-the-less I never experienced listener's fatigue. I did, however, experience "white cheek" syndrome from sitting in my chair listening too long. LOL!
I have another friend here who owns N803s driven by a SA-250 Mk4. here, too, no listener's fatigue & I've been over to his for extended periods of time).
(I did own the B&W DM604S2 for 3 yrs & I know that they are not very discriminating speakers compared to the N-series. Never-the-less I never experienced listener's fatigue. I did, however, experience "white cheek" syndrome from sitting in my chair listening too long. LOL!
I have another friend here who owns N803s driven by a SA-250 Mk4. here, too, no listener's fatigue & I've been over to his for extended periods of time).