velodyne dd-12 power consumption

i would greatly appreciate your knowledge of how many watts does a velodyne dd-12 subwoofer consume when playing music playing at normal volume. i am trying not to get another power conditioner for the sub. currently my amps, cd player, and plasma tv are sharing a running springs audio haley (1,800 watt output). i am hoping to squeeze in the dd-12 if it doesn't require too much power at normal volumes.
for those interested, i received a response from velodyne:
"Under 'normal' listening conditions in a 'normal' size room, I would estimate the wattage draw to be 100-400 watts. Keep in mind for every 3db increase of volume you double the power required, so going from normal to loud can increase the draw dramatically."