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

Those fuses you looked at.. Replace them.. I don't care what they look like.. -9db? That is a whole lot.. Any way to make sure the highs are actually getting an AC signal? or some serious comb filtering going on.. with that Di Pole

Is it down -9 with just one speaker playing? Turn off one speaker and run your test. Then move the speaker further into the room. One speaker.

The jumpers. Put the stockers back in and then replace the fuses.

Break in is not 5 or 6 days, it takes that long for cables to settle.
Get them off the floor too. If they are on the floor.. 3-4 inches is better. Just to make sure..

2-3 weeks and let the crossovers break in.

All I got for no money! :-)

It takes 4-6 months to break in a set of Teflon caps.. They sound terrible the whole time, too.

Patience and due diligence, make sure you're staying out of trouble instead of getting out of trouble.. You'll get it... I'm sure..

Regards

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

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