10cm Woofer DW1021A Specifications : Response 50 Hz to 20,000 Hz Impedence-8.0 +/-1.2 Ohms Resonance Frequency-50Hz +/-15 Hz Power : Nominal-10 w,Maximum 40 w SPL-84+/-3 dB. Features : · Size-10 cm (41/2 Inch) · High Performance Cross Fibre Paper cone with high power Rubber   edge · With Field cover For usage near screens · Superior Quality ,High Power, High Temperature resistant KAPTON   Voice Coil · Weight-515gm SPL Graph Construction Drawing Back