Cubic Super Base System / Plus series sub-woofer system. A 31 cm cone woofer with double voice coil structure is installed as a low-frequency unit. It has built-in band division for systemization and a network function to distribute middle and high sound to left and right speakers. Works well. Has some flaws, and comes without grill. To deliver this product properly, it is packed in very strong boxes, thereby encased in bubble wrap. In addition to the strong packaging, the box is labeled as fragile, using orange "fragile" tape. In case of further packing requirements please message after purchase. Method 1-Way, 1-Speaker, Sealed System, Floor Type Units Used For low band : 31 cm cone type Frequency characteristic 22 Hz to 120 Hz Allowable input 2x70W continuous 100W maximum Nominal impedance 4 Ω Output sound pressure level 89.7dB Crossover frequency 120 Hz (built-in dividing network for middle and high range) External dimensions Width 340x Height 360x Depth 350 mm Weight 11.9kg