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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 3 responses by johnto

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.
johnto
972 posts
 
Any tech who says no to Maggie's unless you have a very low watt amp isn't worth listening to. Maggie's may need subs for lack of the very low end but they sure don't lack high end sizzle unless something is wrong with your tweeter. They come with the jumpers or resistors to tame the highs in a lively room. Your tech probably doesn't sell Maggie's so is pushing something else which I doubt will ever match a Maggie for the $$.
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