Depends on the efficiency of your midbass drivers.
BTW, just buy two of those drivers, and the problem is solved. Two 8 ohms drivers in parallel make a nice 4 ohms load.
I’m trying to plan out a system for my Mazda5. No decisions have been made yet, but the Boston Pro 60 sound attractive. I can’t have a box in the rear. I plan to build a box into the spare tire or in the space to the rear of the spare – I’ll be lucky to get .5 cu ft. Is this drive appropriate and what kind of power (aproximately) will be required for bass FILL?