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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
jb1
96 posts
 
This may seem like to much common audio sense but maybe the room &  your equipment are a bad match: If you have another room , you can try an experiment to see if another room yields the same results: If you bought them new, I am sure the authorised dealer would be happy to help. Lastly, there is Magnepan customer support: I am sure you are not the only 1 to have these issues and they would more than happy to  help you.
johnto
972 posts
 
I'm running Maggie 3.7i with Pass gear and the sound is fabulous. You may need more break in time my 3.7 were well over 300 hrs before the magic appeared. Also play with the placement I always favored tweeter in speakers toed in and 18" from side wall with 36" from back wall on mid bass side and 30" on tweeter side. 
Good luck
johnto
972 posts
 
I should add when I first had 1.7 they came without the jumpers installed and had me worried as there were no highs like at the store so double check your jumper connections.
twoleftears's avatar
twoleftears
5,313 posts
 
Size of room? Heavily damped (rugs, curtains, etc.) or not?  Position of speakers relative to walls, listening position?
russ69's avatar
russ69
3,360 posts
 
I just wanted to add, make sure your banana plugs are not inserted too far. They can sometimes foul some wiring or reach the panel. Also take a flashlight and look at the wiring near the crossover and see if you see something disconnected. I seriously doubt both panels would be a problem but it is possible that a new guy mis-wired them.  
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