Why am I experiencing listener's fatigue?


My system is as follows. All thoughts and opinions are welcomed and appreciated.

B&w nautilus 805 speakers with jumpers ,
tweeter/driver grilles removed/tweeters at ear height
Cardas cross single wire speaker cables
Cardas golden reference interconnect
cardas golden power cord
Monster hts 2000 power bar/conditioner
Manley stingray (2 mullard 12at7's and 8 Ei el84's)
sony xa 777es cd/sacd player
7 inch diameter by 18 inches high concrete speaker
stands
blu tac between the speakers and stands
Particle board equipment stand
14 inch (1/4 filled)innertube under the sony
No DIY or professional room treatments at the moment
Stock sony power cord
vertigo
Good to hear you were able to tame the brightness a little. I found that using Acoustic Zen Satori Shotgun speaker cables and Acoustic Zen Matrix Reference Mk.II interconnects in my system took my N803s to another level completely. Very smooth sound, no brightness, no fatigue. Also, I added EchoBusters Corners behind the speakers and that helps a lot as well. Biwiring the B&Ws is the way to go. What you may also consider is another set of tubes for the Manley. I would suggest contacting Kevin at Upscale Audio. He would be able to give you an advise on what tubes to use to get all the detail without harshness. Anyway, good to see the follow up.
Larryken is not bashing. His comments are accurate and quite correct. I agree 100%.
the most important component is 'you'. 'mindset' is more often than not what causes fatigue.