Cambridge Audio Aero 5 - Altavoces (Tabletop/bookshelf, Speaker set unit, 50 - 22000 Hz, Walnut, Wired) Tweeter: 1 x 46mm (2") BMR, Woofer: 2 x 135mm (5.25") . Frequency response 50Hz - 22kHz Recommended maximum amplifier power: 25 - 120 Watts. Magnetically shielded: Yes. Dimensions (W x H x D): 430 x 150 x 208mm (16.9 x 5.9 x 8.2") including grill.