You can NOT get that from 18's, especially tiny motored IB3s, especially in a HOME THEATER LFE setup! 1000 cubic feet? Ported?! Tuned to FIVE (5) HURTZ? Get the F'k out of here! Not gonna happen man. In a car with HUGE motored 10's in tiny high tuned enclosures with 900 gigga-watts? Sure. But not in a bedroom man.
OH, you want hard hitting teeth buzzing chest smashing high thumping bass - YouTube