it only becomes 1 ohm if you have a 2 channel amp which is bridged.
the speakers will only come down to a 2 ohm load. when bridged, the amp perceives a 1 ohm load.
yeah those subs are 4-4's thier not going to drop to 1 ohm no matter what you do.. you need 4-2's and I'm not sure about the amp i always thought you need a 2 channel to drop 1 ohm and below my mmats will drop to .25 ohms. and thier 2 channel.