[Im a bit peeved at Fi]

Well all i can say is that if they have the same everything they should work, but one will always be stronger then the other because of the little upgrade they had, you can always port your Fi's but, put a single port for each sub therefore it will be almost breathing the same and it will all around just sound better for 2 different models...

or another way is you can get the new model and then get a blown model of your sub and change out the magnets and motors and that should be just about the same.

[Break in time?]

Just 4 hours of play time, dont beat the shit outta them, but pound them hard enough.