Two four-ohm loads wired in parallel would result in a two-ohm load. Two four-ohm loads wired in series would result in an eight-ohm load. Eight ohms is a better load for most amps, but two speakers in series would do away with most of the damping factor for both speakers. Many amps wouldn't 'like' a two-ohm load except for light duty use, but at least half of a high damping factor, if it exists in the first place, is preserved when loads are wired in parallel. Check with Outlaw regarding your amplifier before operating at a two-ohm load.

An alternative, while not that practical unless one plans for this from the beginning and has room to expand the budget a bit, would be to buy two 7075 amps, instead of just one amplifier with more WPC, and drive each speaker individually. In cases where two or four speakers need the same signal, use a ‘Y’ connector to feed two amplifier inputs with the same signal. This method preserves the ‘relationship’ between loudspeaker and output channel and would allow odd configurations, such as driving 3 loudspeakers with the same signal.