4) BOSS MR50B 5.25" 2-Way 300W Marine/Boat Car Coaxial Audio Speakers Black 150 WATT MAX Power Handling (300 Watt per 2 Pairs) Impendance: 4 Ohm Frequency Response: 120HZ-18kHz SPL 1 Watt/1 Meter: 90 dB Poly Injection Cone Material