Cadence Acoustics FXB12C Single 12-Inch 500 Watt Super Slim Passive Subwoofer Enclosure Single 12" Passive Subwoofer Enclosure RMS Power: 400 Watts|Peak Power: 500 Watts Frequency Response: 40Hz - 500Hz|SPL @ 1w/1m: 90dB Impedance: 4 ohms|Dimensions (L x H x W): 20" x 15" x 7.5" Cadence FXB12C single 12" passive subwoofer enclosure Power Handling: 400W RMS/500W Peak Frequency Response: 40Hz - 500Hz Sensitivity: 90dB @ 1w/1m SPL Dimensions (Wx H x D): 20" x 15" x 7.5"