intercourse

ok i have 2 ten inch d4vc kicker l5's wired to 1ohm on my soundstream rubi 1000. my ? is, if i put my motors out can it hurt them? i have the 180 switch or 160 on my amp, i think if i put the motor out i have to flip the switch.or so i read. also whats the difference between the motor in / out...