Bass Busters improve bass reproduction in your audio or home theater environment by removing unwanted low frequencies. Standing waves are formed by sound bouncing off walls, floors and ceilings and crashing into each other at certain points in the room. These low frequencies need to be removed to allow you to hear the full bass extension your speakers are capable of reproducing. Bass Busters increase the dimensionality of your soundstage imaging by reflecting unabsorbed sound in a hemispherical pattern back into the room. They are available in 4, 5 and 6 foot heights.