The area where the window would normally be in an older XB has these nice deep pockets. Thinking about installing some speakers in them. I have a 12" sub in the back, but it really doesn't provide the mid bass I want...just a lot of super low end rumble. Anybody got any idea of what might fit there? 6" round looks like the ticket...maybe 6x9s? Making the enclosure isn't a big deal. Just wanted to see if anybody had done that and if so, lemme see some pics.