Tightening loudspeakers screws...

..regarding Narrod's question. B&W require specific torquing for some of their speakers. The drivers have a foam gasket which if tightened too tight can squash the gasket and nullify the good research that went into the speaker itself. There are many manufacturers that have tightening issues. Check with your builder to see if they recommend tightening...and also, if you tighten the drivers too much, you can warp or strip the attachments. Be careful.

Stringeen, that makes sense. I just can't imagine any benefit to leaving them "loose".

My advice is to tighten the screws just to the point of firm resistance. I have owned several Meadowlark Audio speakers that also had a dampening material between the drivers and the baffle. I simply stop turning the screwdriver when the screw tells me to.
Don't leave the screws loose but don't over tighten either.

I believe the logic of leaving the screws loose is to convert vibrational energy to heat by having friction between the driver flange and baffle. It's a bit of a stretch...

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.