WF-1075 Chrome Steel Basket 10" Subwoofer With 40oz Magnet Injection Cone, Rubber Edge 2" Aluminium Voice Coil Impendance: 4ohm Max.Power: 450Watts Frequency Response: 30-1.5kHz Sensitivity: 90dB WF-1275 Chrome Steel Basket 12" Subwoofer With 40oz Magnet Injection Cone, Rubber Edge 2" Aluminium Voice Coil Impendance: 4ohm Max.Power: 600Watts Frequency Response: 20-1kHz Sensitivity: 90dB