4) BOSS P55.4C 5.25" 600W 4-Way Car Coaxial Audio Speakers Stereo P554C 2 PAIR MAX Power Handling: 300 Watts per pair (600 Watts per 2 pair) Size: 5.25" Impedance: 4 Ohm Frequency Response: 85Hz-20kHz SPL: 93 dB