buy one of these and call boston parts and get a passive radiator put them on a one cube box (really small) tuned to 30hz and be amazed. 4 ohm at 1k is easier than 2k at 2 ohm.
look for old school 2 channel amps //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif and these dont need a full 1k to perform