CDT Audio CDT Audio Subwoofer 8" Cast Alloy Audiophile Subwoofers (Sold as Single Subwoofer) Mounting Depth: 4" Mounting Cutout diameter: 7 1/4" CL Series 8" Subwoofer Powerhandling: 200watt RMS/400watt Peak  Complete Specifications - Here Sensitivity: 87.1 dB Frequency Response: 10-400Hz Nominal Impedance: 4 Ohms Voice Coil Diameter: 1.53" Magnet Weight: 30 Oz. stacked Sealed Enclosure Recommended: 0.3 - 0.7 Cu Ft |