ID10D4 V.4 - Image Dynamics 10" 300W RMS 600W Max Dual 4-Ohm V.4 Subwoofer ID10D4 V.4 - Image Dynamics 10" 300W RMS 600W Max Dual 4-Ohm V.4 Subwoofer Power Handling: 100-300W RMS Frequency Response: 16-180 Hz Sensitivity: 86 dB (1W/1M) Mounting Depth: 5.12"