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 jrwaudio

I have the Maggie's 0.7's ( room won't support 1.7's) for money spent I'm very satisfied with the performance of my Maggie's 
As most know they need watts/current
I tried using my VAC KT88 tube 100 watt amp that has 8,4,2 taps  l also felt l was missing something also on the top end
l decided to try my SS amp that puts out 500watts@8ohm 650@4ohms and 1,200 watts@1ohm +65 amps for 500 milliseconds  I did the fuse, jumper upgrade and Magna Risers speaker stands
All l can is, that it totally transformed my .7's
I position my Maggie's 48" into the room, 110" apart, slight toe in and l have approximately 60" to the side walls l sit 120" from the speakers 
All l can say is now they have excellent inner detail dynamics and nice extended highs