actually, out of phase would almost guarantee cancellation.. lolx2
Worst case scenario, you get better output when wiring one subwoofer out of phase... this would be a simulated kind of isobaric setup.
Only an issue with cancellation if the trunk is about 14 foot wide, as Death by Bass pointed out.Holy cancellation batman.
Not good.
Agreed.actually, out of phase would almost guarantee cancellation.. lol