Tightening loudspeakers screws...

I believe the foam under the driver is to achieve an air seal. Silicone caulk works even better, and holds the driver in place without need for any screws at all. If it becomes necessary to remove the drive this is not too difficult to do using a razor blade.

Rotarius said..."His reasoning for using brass screws is pure bs".

Of course the bs is pure. Second class bs would not be high end.