[bigharley]

If you run them in parallel at 1 ohm you can safely run a 1200 watt rms mono amp to them in an 8 cubic foot sealed box and stomp down the block.
Or run them in series and get an amp that pushes 1200 watts at 4 ohms RMS.(cheaper In price this way)or find a monster 2 channel amp that runs 600 watts RMS by two at 2 ohms stable or 8 ohms each. either way if you box is kool then these ways you can not blow your subs.
By the way if you port or vent a speaker and go over the RMS rating you will also blow it up.