Stick with Magico and work with the subs. If you cross at 100 Hz or above and put a high pass filter on the Magicos thingswill get much more dynamic. I have never used REL subs so I can not comment on them. Go to a store that has them and turn them up high with something like Jeff Beck's Loud Hailer on. Put your hand on the sub. A good sub you'll just feel a hint of vibration. If it is really buzzing away the enclosure is not built well. Ideally you should feel nothing. Very few subs can do that. Have you thought about the 15" Magico Q sub? It is actually a dual
15" so you might get away with just one.
15" so you might get away with just one.