Velodyne sub with loose allen bolts?


I just purchased a pair of DD-15s and noticed the allen bolts on front are REALLY loose. Then I checked my old DD12 and they were in the same state. I snugged up the DD15, but thought I should confirm that these should be snug? Hopefully it has nothing to do with the suspension of the driver, or whatever.

BTW, there was a bit of cabinet vibration/noise which disappeared after tightening. In fact, that is just why I was nosing around the bolts to begin with.
amansker
I have a DD12 and periodically snug the fasteners as well as my speakers. I think anything that vibrates in the course of operation will eventually "loosen" and need occasional re-tightening.
Velodyne replied to my question and suggested snugging them.
Of course they should be snug. 
"I think anything that vibrates in the course of operation will eventually "loosen" and need occasional re-tightening."  
+1