IDQ12 V.4 D4 - Image Dynamics 12" 1500W Peak Dual 4-Ohm IDQ V.4 Series Subwoofer 12" Dual 4 ohm IDQ V.4 Series Subwoofer | Mica-reinforced polypropylene cone woofer | Parabolic roll surround | Ability to custom match the basket color to your personal installation | Conex spider with integrated tinsel leads | New V4 Metal Basket | High-temperature aluminum voice coil | Proprietary voice coil attachment design Power Handling: Peak: 1000 watts | RMS: 500 watts | Recommended Power Range: 50-500 watts Nominal Impedance (IMP): Dual 4  | DC Resistance (Re): 2.90  | Resonance Frequency (Fs): 30.19 Hz | Equivalent Volume (Vas): 68.93 L | Electrical Q Factor (Qes): 0.61 | Mechanical Q Factor (Qms): 4.67 | Total Q Factor (Qts): 0.54 | Peak Excursion (Xmax): 28 mm | Piston Area (Sd): 519.45 cm2 | Sensitivity: 86.80 dB 1w/1m Sealed Enclosure Suggestion: 1 cu.ft. | Ported Enclosure Suggestion: 1.5 cu.ft. | Displacement: 0.10 cu.ft. | Mounting Depth: 5.91 in | Outside Diameter: 12.46 in | Cutout: 10.87 in