10" /12" Ported subwoofer Box/enclosure CB250-4BX10" Ported Bass subwoofer Box10" woofer ,40 OZ Magnet2"Voice Coil, PP Cone With Rubber SurroundMax Power:250WSensitivity:90dBFrequency Response:35-1000HzCB300-4BX12" Ported Bass subwoofer Box12"woofer ,40 OZ Magnet2"Voice Coil, PP Cone With Rubber SurroundMax Power:350WSensitivity:90dBFrequency Response:30-1000Hz