Skar Audio PAX65-4 6.5" 520W 4 Ohm Neodymium Midrange Car Loudspeaker, Each Peak Power Handling : 520 Watts 2" High Temperature KSV Voice Coil Lightweight - Neodymium Magnet Vented Backplate with Heatsink for Thermal Efficiency Sensitivity : 94.8 dB Impedance: 4 Ohms Sold Individually RMS Power: 260 Watts Peak Power: 520 Watts Magnet Material: Neodymium 6 Layer High Quality Spider Useable Frequency Range: 85 Hz - 8 kHz Sensitivity: 94.8 dB 1W/1m 2&#034; KSV Voice Coil 2L/2T