Are you sure it's not your hearing? Compression can introduce harmonic distortions that can cause ear resonances.
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Everything is tight? Make sure they are torqued in place and not vibrating because of another driver. Check the securements coming lose from driver to faceplate or faceplate to cabinet.. Check for wires being lose and vibrating.
I'm guessing it's a mechanical noise. You can use a small vac hose to listen whether it is a vibration, or a cracked part. Cabinet or actually the driver, low volume, ay..
LPad if you have them.. clean them move back and forth like 3000 times. :-)
All I have that cost nothing...
Ouch... special filter on the face of the tweeter.. for incoming distortion, your blocking something going in or out with your hand?.
Touch the face of the tweeter GRILL diffuser with a pencil eraser, or something pretty soft.. Is it cracked?
Looks like a job, if you had to change it, but you never know...
I had tweeter issuews, found out it was a blown (foam inside completely gone, after 17 yrs use), both with new voice coil/diaphrams tested at 95%,, tech guy said, get new ones with the new Mundorf Cap xovers,,so I did, = $700. gave the old ones away to a DIY forum amigo.
New Millenniums sound nearly same as old, but obviously have a tiny nuance perf vs the old
I figured I'll never have to buy another tweet ever again, so I guess worth the $700
To start out switch the speaker wires on the amp. Right becomes left and left becomes right. Keep the polarity correct. If it stayed with that speaker it’s the speaker. I too feel likes it’s the crossover. You can swap parts from one speaker to the other. Swap the tweeters. If the bad tweeter still sounds off in the opposite cabinet it is the tweeter. If it did not it is the crossover. Usually the capacitor goes on the crossover and you get some weird sounds like you described. If they will allow it replace both crossovers. So you keep a good balanced sound signature. Even if they charge you a few bucks for the second one it is worth it.
So! I contacted Paradigm, bad news is indeed these do not have warranty due to being second handed so they can't inspect them, the good news is, they were able to help me by sending the service manuals which explain how to open the speaker.
So I opened the speaker and started observing any anomalies.. and soon enough I find a metal groove that looks kinda unnecessary and strange and then saw there is a metal dot that protruded from the backside of the grill that's not aligned to the groove!
So I had to push the grill out (it's taped with double sided adhesive) with a lot of force, rotate the grill, and then snap them back where the metal dot exactly aligned with the groove.
I then checked any other screws or grooves that might have issues, one of the screw on the tweeter's housing felt a bit loose so I also tightened that one.
Then I put the grill back , the weird distortion is now gone!
Below is the picture to illustrate the metal dot issue https://imgur.com/WTt8kNA