My New Magnepan 1.7i's sound dull and lifeless on the top end...why?

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.

Size of room? Heavily damped (rugs, curtains, etc.) or not?  Position of speakers relative to walls, listening position?

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.  

-PrimaLuna EVO 400 Monos


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WOW those monos are some power pack amplifiers, 
Built in same factor as Cayin, Spark Audio, High quality, 
Very surprised you are not getting higher fidelity in all ranges..
hummmm,. 
I was close to buying the LRS, until my tech geek stepped in to cancel the project, 
Said the LRS has 4 phms impedence, 86 db, not friendly to the Defy7,,**ok for string quartet**, well the purpose was for big full orchestra symphony,,
Tech: *Not going to happen,**.

Not sure if what he is hinting at has anything to do with your issues of faulty highs, no sparkle, shimmerings, dynamics in upper fq's..
Sorry to hear of  this venture into Magnepan. 

There  is a big faithful magnepan group here,,maybe one these Magnepan-ians
can *chime* in here and give us some  solutions to this roll off issues.
Good Luck

If you pull the jumpers and just plug into the highs, what do you hear?

If they’re working they are working. Put the jumper bars back in and let them break in. It’s all placement and break in.

One speaker in the middle of the room. Easy test, to check for combing. Di poles on the same baffle plane SUCK.. They have a wonderful sound, but you cannot ever get the front and rear poles to be coherent.

That still has nothing to do with "is there a signal coming out of the speaker" vs There is a signal coming out but is being combed and canceled. That I could understand.

A pillow right behind the highs will show if that is the case. Cancel the rear pole.. The DB level should increase..

Regards