With two dual 4-Ohm voice coils your wiring choices are:
All in parallel = 1-Ohm
Each voice coil in parallel, subs in series = 4-Ohm
Voice coils in series, subs in parallel = 4-Ohm
Voice coils in series, subs in series = 16-Ohm
Voice coils in parallel = 2-Ohm load
Voice coils in series = 8-Ohm load
One amp: I doubt you want to to do the all in series because of the relatively high value. Don't know what the Brutus is rated at with a 4-Ohm load, but you would want 1KW for max power (based on ratings your provided for subs). I don't know if the Brutus amp can handle a 1-Ohm load.
Two amps: Again I doubt if you want to do the series wiring. The JL amps can handle the 2-Ohm load fine (but will cost a bunch more than a single Brutus).