My New Magnepan 1.7i's sound dull and lifeless on the top end...why?


First time Magnepan owner - 5  days old 100+ burn-in hours on them
Associated Equipment:
-Denafrips Terminator Plus
-Holo Audio May KTE version
-Pass Labs X22 Pre-amp
-PrimaLuna EVO 400 Pre-amp
-Pass Labs XA100.8 Monos
-PrimaLuna EVO 400 Monos
-AntiCables interconnects and speaker cables
-Stock tweeter attenuator jumper replaced with AntiCables level 5 spade jumpers on the 1.7i's

My spectrum analyzer indicates both speakers highs are falling off beginning at 1.25K and are 9db down from 2.5K on
Been playing around with speaker placement and room treatments for 2 days now without any remediation. What am I missing? Suggestions appreciated.
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Showing 1 response by dain

Agreed, very odd, especially since whenever some solo violin comes up at random it's actually impossible to skip or change the tune since it's so darned engaging. One thought, you have a lot of 'gear' going on here. Maggies really aren't that finicky, I recall using some of the priciest Nordost Blue heaven cable and it really dulled things down. Mostly bass, but plain 10 gauge wire sounded much better. If you are 'upgrading' anything based on cables, I'd start there, replace with more ordinary and especially high gauge stuff since Maggies like current.