A driver and it's enclosure should be designed for each other for proper operation. Just chucking another driver in there could be an improvement or, just as likely, a downgrade. Carefully measure the inside dimensions of the box and its ports, if any, and use modelling software like WinISD to choose what driver would be best for the box you have.
The crossover has parts that are rated for 80-100W. Using more power could well be fatal for it.
Last edited by BassmanPaul : 09-12-2013 at 04:03 PM.