b&w slotted screw on the back tension torque????

thanx for both of you i was actually refering the one slot screw
when i fastened up tight sound became really solid so i loosened a bit then sound became smooth.
i found that the transportation philips screw and plastic plate which secure midrange during transportation has a paper between them which says remove after transportation is done and the hint is that paper is bent a little bit
so the correct factory setting is one slotted screw should be protrude a little bit out from aluminium surrounding at which just a finger tight yension can be feeled
that is my conclusions
anyone who has exact numerical tension paramer please give me some help

Depends on what you are discussing. There is a Philips screw that holds a small plate in place for transportation security. That screw (and plate) can be removed once the speaker is in place.

The screw actually threads through a larger flat, one-slot device which tensions the midrange driver mounting. It has been factory-set and need not be adjusted. It should NEVER be removed.

Strangely, there is no mention of any of this in the user's instructions.

I've read where you snug it down tight and then back off half a turn. Give it a try...