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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.
128x128nayls02

Showing 1 response by mastering92

mastering92
870 posts
 
That sounds like unusual behavior for pair of speakers - especially for those.

Try to use an equalizer (component) sound field processor, or the equalizer app on a smartphone/laptop. If you are able to correct the anomalies, then your speakers have issues.

I would recommend this test: https://www.youtube.com/watch?v=aKdEoiNyyZc

also check for the burn in test (for headphones) also works for speakers.
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