4) NEW Polk Audio DB651 6.5" 180 Watt 2-Way Car Marine Speakers + 4 Channel Amp 180 Watt MAX (Per Pair) 60 Watt RMS (Per Pair) Type: Dynamic Balance Woofer with Polymer/Mica Composite Cone with Rubber Surround Efficiency: 92 dB Nominal Impedance: 4 ohms