Is there anything special to put behind the subs when you drop it into the enclosure so air does not leak between the sub and the front face they are resting in?

you can ductape.

use a type of sealant(i use this caulk stuff thats clear) and wipe it along the gasket.

If your speaker does not come with a rubber seal you can go to Lowes and buy some weather stripping.

If your speaker does not come with a rubber seal you can go to Lowes and buy some weather stripping.

This sounds fine, i have a rubber cover, although it doesn't seem like this would seal it up. These are type r's and it is the rubber cover that come with them.

That should work fine, I mean unless you have some tears or cuts in it.

That should work fine, I mean unless you have some tears or cuts in it.

I agree

No they are perfectly fine, I was just making sure. Thank you

parstexpress.com has speaker gaskets.