Details: With its switchable monopole/dipole radiation pattern, Ci 130DS is the ideal surround/rear effects speaker to partner Ci 200QT for high performance built-in home theatre. A pair of 80mm (3 1/4") midrange/hf drivers facing 80° apart complement the 130mm (5 1/4") bass driver in one compact unit Model Ci 130DS Design di-pole/bi-pole, 3 driver Frequency response at 15° horizontally off axis ±3 dB 70 Hz - 8 kHz Crossover frequency 750 Hz Amplifier requirements 10 - 60 W Sensitivity (2.83V/1m) 88 dB Maximum output 106 dB Impedance 4 Ohms Magnetic shielding no Weight 2.8 kg (6.2 lbs) Dimensions (H x W x D) 367 x 277 x 88 mm7.8 x 7.8 x 3.5 in.