Word of caution for all of you gasket tape users... Started dismantling the ol' vertical arrays and ran into a bit of a snag...
If you don't feel like wasting 2 min of your life, it's just a boring short video of what I had to deal with because of how the gasket tape bonded to the rubber surround that SI supplies with their sub.
I have always tossed the rubber gasket that came with subwoofers and just used the tape to seal. And even then I have had trouble getting woofers out. BUT I just tilted the cabinet forward and had a large pillow in front for the woofer to fall onto.
Either way the video will probably help others who still use the gaskets.
I use closed cell foam tape, 3/4" wide x 1/4" thick.
First, remove and discard the rubber gasket.
1) Paint a light coat of contact adhesive on the box driver recess seat and allow to dry.
2) Apply the foam tape. Overlap the tape once you get all the way around.
3) Cut through the overlap with a sharp utility knife, perpendicular to the cutout.
4) Carefully peel away the useless parts and butt he foam tape seam so that there are no gaps.
5) Set the driver in the hole.
6) Pre-drill the holes using a drill diameter that allows your screw size to fit tightly without exploding the MDF.
7) Instal the screws to snug. Then do the final tightening of the screws as you would tighten the lugs on a car wheel, crossing back and forth.
No leaks, guaranteed, every time.
To remove the driver, use a pair of paint can openers. They have a hooked end that fits into the drivers mounting hole and grabs the frame. Start at one hole and slowly lift the driver to break the seal without damaging the foam.
Do NOT use caulk of any kind. It's messy, unnecessary and silicone is problematic from several angles.
The rubber gaskets on mine stuck to the paint on my old enclosures. Took some paint and ply off with it when I pulled them out. Can I just tell you how difficult it is lifting out a 90lb lms ultra that's basically glued in place?
I never rely on screws into MDF. On everything I build, I use 3/4" MDO for the inner baffle, so that the screws have something to bit into. MDF sucks for holding a screw. Most likely a good sub would loosen the screws over time, if into MDF and cause a leak.