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Shrill high frequencies

I recently added an Isotek power conditioner to my system. Everything improved with one quibble; the highest frequencies are a bit bright for my taste. I'd be grateful if someone could suggest a workaround that doesn't entail replacing any components. Perhaps cables? 

ott
audition__audio
1,776 posts
 

Tell us about the rest of your system.

lalitk's avatar
lalitk
6,180 posts
 

Did you allow enough ‘break-in’ hours? Also, experiment with PC feeding the IsoTek. 

blisshifi's avatar
blisshifi
1,270 posts
 

+1 lalitk

ott OP
37 posts
 

Amp is Luxman MQ-88UC, preamp Audible Illusions Modulus 3b factory upgraded, sources Modwright modified Sony HAP Z1ES,.Magnum Dynalab MB 108 tuner. All IC cables are Cardas Clear , Speaker cables Nordost Frey 2. Speakers are KEF LS 50 or Goldenear Triton 1, subs REL Stentors. 

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