DesignThree-way bass reflexDrive unitsUni-Q driver array: HF: 25 mm (1 in.) aluminium dome with MAT MF: 125 mm (5 in.) aluminium coneLF: 4 x 165 mm (6.5 in.) aluminium coneFrequency range free field (-6dB) Short port: 43Hz - 45kHz Long port: 40Hz - 45kHzFrequency range typical in roombass ..