38 cm subwoofer / 15 inch subwoofer 150 watts RMS / 450 watts PEAK Subwoofer size (in, mm) 15, 38.1 Max. Recommended Amplifier Power (Watt Peak)450 Max. Recommended Amplifier Power (Watt RMS) 150 Frequency response (Hz) 25-800 Mounting Depth (in, mm) 7" (17.8) Hole cut-out diameter (in, mm) 13 13/16 (35.2)