home audio type question

[Scarrell]

well i just bought THIS HERE , just to do it i guess....now i was wondering if i could take the 8" out of it, and replace it with like a....RE 8" or something, either take the 8" out and put the new sub in(if it will and all ofcourse) or if i could build a box for the 8" i buy and just use it instead. would there be any problems doing this?