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The Sundown Audio M-Series M18 is an 18-inch car subwoofer rated at 2000W RMS and 4000W peak, built on the company's patented Mega-series frame with a Mega Roll surround. Its quad-stack 200mm motor with a hyper-extended pole and 59.5mm of mechanical clearance gives very long excursion for deep, low-distortion bass. It is the entry point to Sundown's Mega line, so it sits below the X, Z and NS series in output ceiling but offers the same frame and surround design. It suits serious bass builds with the amplifier power and enclosure volume an 18-inch driver demands.
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Lowest price we've seen: $699.99 on Nov 12 at Walmart. Tracked across 12 stores since Nov 12.
The Sundown Audio M-Series M18 is an 18-inch subwoofer rated at 2000 watts RMS and 4000 watts peak. It is the entry-level model in Sundown's Mega series, built for deep bass with low distortion. It uses the Mega series patented frame, a Mega-Roll surround and an etched all-black backplate.
The motor has a quad-stack magnet structure 200mm (7.87") in diameter. The magnet stack is 88mm (3.46") tall, with a hyper-extended pole and a full 20mm thick top plate. Clearance allows 59.5mm to the mechanical bottom (4.68" peak-to-peak), so the cone is effectively bottomless. A magnet inner-diameter aluminum shorting ring reduces inductive distortion.
The motor drives a 3" 4-layer round wire aluminum voice coil wound on a thick aluminum former. It delivers 35mm of one-way linear excursion. Cooling comes from a high-velocity pole vent, a vented magnetic gap through the backplate and a cast-aluminum frame-base venting system. The Mega-Roll surround and PG linear suspension are designed for low bass extension in a small enclosure. The subwoofer works in the same enclosures as other Mega series subwoofers and also suits sealed and infinite baffle (IB) installs.
