If your amplifier is rated at 1000watts @ 2-ohms rms, then you use those values as long as that is what your subwoofers are wired to.
Basically, use the final ohm load on your speakers when they are wired into the ampilifier, then tune to the amplifiers rated rms at that given load.
DO NOT try to squeeze more "power" out of the amplifier than what it is rated at. This will result in a clipped signal that WILL damage your subwoofer.
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