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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
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.
russ69's avatar
russ69
3,360 posts
 
I hate to say it because I'm a Prima Luna fan (have an EL34/KT88 integrated). But they don't extend as well as a good SS amp. Gold Lyon KT88s helped but switching to SS works better. 
Make your room more lively, put KT88s in you amp and that is the best you can do. To tell you the truth Maggie 1.7s don't have the best tweeter, you'll need 3.7s for that but you can get them to work reasonably well.  
tsushima1
1,165 posts
 
@nayles02

Strip out the Anti Cables speaker cables and try running just the panels alone with any decent speaker wire that you have to hand...
If that improves matters try replacing the IC’s as well...


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