Rock sound model no RS SW 12 

Specifications:

12" ( 310mm ) Subwoofer

Black PP cone with rubber edge

1.74" ( 44.43mm ) dual voice coil: 4Ω + 4Ω 

2204g ( 39oz * 2 ) Strontium magnet

Impedance: 8Ω/2Ω/4Ω+4Ω

Rated Power: 300W

Max Power: 2800W

Frequency response: 30 ~ 900Hz

Sensitivity: 87+_2fB/1W at 2m