The SPEKTOR1 is an ultra-compact bookshelf speaker.Constructed with DALI traditional wood fiber cones 115mm woofer and 21mm silk dome tweeter, the SPEKTOR1 sound is beyond the size.Easily create a compact stereo setup with the surround system, as a front speaker or surround speaker. Format: 2-Way Drive Unit: 0.8 inches (21 mm) Soft Dome 4.5 inches (115 mm) Woofer Frequency Response: 59 Hz - 26000 Hz Sensitivity: 83 dB (2.83 Vrms/1 m) Impedance: 6 Ω Dimensions: Height 9.4 inches (237 mm) Width 5.7 mm) Depth 7.7.7 lbs (19 lbs (19 kg)