Alpine SWT-10S4 10" Subwoofer 4OHMS SWT-10S4 - Alpine 10" 350W RMS Single 4-Ohm Truck Subwoofer 10" truck subwoofer with 4-ohm voice coil Power handling: 350 watts RMS (1000 watts peak) Frequency response: 30-200 Hz Mounting depth: 4-3/16"