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The Auralex SubDude(HD) is a 15 in. x 15 in. x 2.5 in. platform wrapped with a cleanable black velour to fit any room setting. Its purpose is to prevent sound from transmitting through your subwoofer to surrounding surfaces. Subwoofers create big vibrations (low frequencies) that you can feel in the floor and in objects placed nearby. When the source of the vibrations is coupled directly to the floor it causes these objects to vibrate or resonate – not only at the fundamental pitch the source is creating but also at harmonic frequencies that discolor the true sound from the source. Now you have two (or more) objects vibrating, which creates an acoustical problem called “secondary resonance”. The SubDude effectively reduces secondary resonance by decoupling your subwoofer from the floor so you hear your sub and not the vibration of the other objects in your listening environment. When speakers are tested in anechoic chambers, they are isolated from objects around them that could introduce resonance. With the SubDude, you can recreate a similar scenario in your living room.