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

Suspect that they are not propely hooked up/connected.

If damaged it's unusual that both speakers would have the same fault.

Not a clue as to what the "add-ons" mentioned by the OP are, but suggest hooking them up stock (nasty jumper plate and all).

I responded to another Maggie owner here with similar complaints and the HF problem was resolved with proper hookup (poor electrical contact was the culprit I think, but too lazy to look back through my posts).

DeKay

 amp, or a modern parasound amp.  Needs an amp that can deliver fast settling amperage


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This is what my tech was getting at. 
~~Requires high(er) current~~ than what the Defy7 can deliver = Not a  match made in heaven.
Is what he was trying to express.
He suggests , sure for string quartet, the Magnepan + Defy marraige would be excellent..
Well thats not what was the intention. The magnepan was for voicing full slam orchestra, in super high definition rock solid bass, rich detailed perfect voiced midrange, and the most glorious highs ever heard by the human ear..
Is what I had set my hopes on for the Defy7.

Magnepan is quite magical, we all know this based on countless testimonials. 
The caveat is a  amplification current that can deliver the goods.
Lets stay focused. 

As I  now recall was often mentioned when discussing panels wayyy back in my Topic, ShootOut at the OK Corral...
How could i foget,,,which is why i never reconsidered going anything **panel*

dekay3,770 posts07-29-2021 9:10pmSuspect that they are not propely hooked up/connected.

If damaged it's unusual that both speakers would have the same fault.

Not a clue as to what the "add-ons" mentioned by the OP are, but suggest hooking them up stock (nasty jumper plate and all).

I responded to another Maggie owner here with similar complaints and the HF problem was resolved with proper hookup (poor electrical contact was the culprit I think, but too lazy to look back through my posts).

DeKay


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I aint buying in.
No evidence his hookups are faulty.

I reiterate: The tweeters in OP's speakers are either working properly or they are not.  And nobody here knows what other variables/factors are present in OP's situation. Not every problem nail needs a sledgehammer. (HUH? whatever does that mean?)

I suspect that @dekay  is on the right track.  

I will say it's (sorta) fun to read all the responses in this thread.  But I think it's time for me to unfollow. Best wishes and I hope OP gets it sorted out.

mozartfan would you put a cork in it?

ONCE again read before you post..

I offered a reasonable solution it see if the tweeter section is playing and if it is, let it break in.

Second a di pole will comb filter like no other it will cancel out front to rear because of the common pole.

PUT a pillow over the back of the tweeter section to stop the combing,. IF that works you know it’s combing. NOW position the speaker to reduce the combing as much as you can.. The -9db should go down. 

You can double check for combing by using only a single speaker, pull it to the center of the room..

TWO ears TWO eyes, ONE mouth... Order away, they are great speakers..

Regards