Soundsing Audio Manufacturing Co.,Ltd is one of the leading China high power 21"subwoofer manufacturers and suppliers,Website:://.soundsingpro.com, providing with high power 21"subwoofer wholesale, welcome to import high quality products from our factory. SD-21002A is a high power 21 subwoofer. Big size magnet and voice coil, dual dampers, low distortion. To have better strength cone, we have done special treatment. You want deep bass 21” speaker, this is quite good choice. Products specification Size:21” Rated Power: 1500W Peak Power:3000W Impedance:8 Ohm DC Impedance: 5.5 Ohm Sensitivity:100dB Frequency Response:25hz-1.8khz Voice Coil Diameter: 5 Inch Voice Coil Wire Material: ALR Bobbin Material: BAF Voice Coil Layers: 2 layers Dampers: dual Conex Cone: paper Magnet Size:205 OZ Mounting Detail: Outer diameter:541mm/21” Hole Cut Out diameter:493mm/19.4” Depth:243mm/9.56” Packing Information: 1pc one carton, brown inner and outer box Carton Size: 62*62*30CM Other Information Place of Original: Guangzhou, China Payment Terms: T/T, Western Union, Money Gram Port of Delivery: Huangpu, Guangzhou, China Production Lead Time:30days after receive 30% T/T