FWIW, the speakers on my cabs are front mounted, held in place by large brackets that bolt down.

Here are a couple of pix:



http://www.thefret.net/album.php?alb...achmentid=2278

http://www.thefret.net/album.php?alb...achmentid=2277

The grill is expanded metal held in place by sheet rock screws, counter sunk washers, and rubber feet (used as spacers).