IDQ10 V.4 D4 - Image Dynamics 10" 1000W Peak Dual 4-Ohm IDQ V.4 Series Subwoofer 10" 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): 37.15 Hz | Equivalent Volume (Vas): 33.10 L | Electrical Q Factor (Qes): 0.95 | Mechanical Q Factor (Qms): 2.98 | Total Q Factor (Qts): 0.72 | Peak Excursion (Xmax): 28 mm | Piston Area (Sd): 383.58 cm2 | Sensitivity: 84.40 dB 1w/1m Sealed Enclosure Suggestion: 1.1 cu.ft. | Ported Enclosure Suggestion: 1.45 cu.ft. | Displacement: 0.07 cu.ft. | Mounting Depth: 5.81 in | Outside Diameter: 11.04 in | Cutout: 9.57 in