I'm planning on building a sub enclosure in the future and have had difficulting finding an answer to the following question. During my research of different enclosure designs, I've noticed several dual sub enclosures that use a separator or baffle that separates the enclosed airspace behind either driver. That is, the airspace behind either driver is not shared and it's as if this type of dual sub is made of two, single subs glued together. I've also seen enclosures that don't separate this airspace. What kind of tradeoffs does this design feature have on subwoofer performance? Thanks in advance to anyone who can share some wisdom!