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The P1 series is recognized as "The Woofer of Choice" for dedicated car audio systems, being the initial model in a line of internationally renowned subwoofers. The P1S4-15 is a 15-inch 4-Ohm SVC (single voice coil) subwoofer capable of handling 250 Watts RMS / 500 Watts Max power, equipped with custom 10-AWG nickel-plated push terminals. It utilizes a kevlar fiber reinforced paper cone to produce powerful bass you can sense, and a unique spider plateau venting design offers voice coil cooling to improve performance. Ideal for standard sealed or vented enclosures. Sealed (Vb): 1.58 cu. ft. (44.7 Liters). Vented (Vb): 2.66 cu. ft. (75.3 Liters). Mounting Depth: 6.98 in. (177.2 mm). Cutout Diameter: 13.85 in. (351.8 mm)