If I buy kickers ZX1500.1 1500 watt amp that is rated for 4 and 2 ohms and run it to 1 of there kicker S15 solo-baric L7 D2' subs can i run it @ 4 ohms til i get the other sub which will be very shortly after? Or do i just run it at 2 ohms and not push it all the way til I get the other sub?

Thanks ahead of time.