QD-Bass (Quatre Dispersion Bass) technology uses down-firing drivers with square, pyramid-shaped reflective plates to radiate the sound efficiently in four horizontal directions. This unique reflective plate diminishes adverse effects caused by the floor surface and reduces resonance between sound waves reflected from the floor and the unit. QD-Bass also minimizes turbulence caused by reflection from the leg. Changing the height of the square pyramid varies the acoustic load, permitting relatively simple high-cut adjustment and improved bandpass properties.

The QD-Bass system provides extraordinary power and smooth frequency response from a relatively compact unit. It also allows for greater freedom of placement, since the sound radiates with equal effectiveness in all directions.