Full Marty 21 - Weird sound running REW sweeps

[vingeance]

UPDATE: Fixed! Driver screws were not tighten enough.

Hello,

I got a UMIK-1 and ran my first REW sweeps to measure the response of my Full Marty sub at different locations.

I am hearing a strange noise when running the sweeps with the Full Marty sub. I don't hear that noise running the same measurement with a PB1000.

Does anyone know what I could do to investigate the issue?

Here is a link to a video where you can hear the sound.

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[AudiocRaver]

Sounds like a grille rattling.