I looked at the pics, purely superficial. You can get a good product to take care of them. But as far as performance, no issue. Like Eric said the rear spider(s) are the primary suspension. Surrounds hold the center and are actually a part of the port on the driver. With no port (s), on an enclosure, how would air exchange? The surround, center cap, or phase plug clearance, that's it on IB setups..
Regards
Regards