MB Quart MS1-304 600W 12" Dual 4-Ohm M-Line Series Car Subwoofer MS1-304 - MB Quart 12" 300W RMS Dual 4-Ohm M-Line Series Subwoofer Power Handling: Peak: 600 watts | RMS: 300 watts Thermal formed PP cone & dust cap Top-mount depth: 3" Sensitivity: 86 dB