yes they can. I have done it. They just dont sound good.12" R's can't take 1000 daily.
And at one point I ran my Type R 15 on a zx2500.1 @ 1 ohm, then later on (2) Sundown 3000's @ 4 ohm strapped. They will take some power if you know how to control the volume knob.The 12" Casey had blew off 800
My 12" went off on 750