SoundQubed HDX3 18" Competition Subwoofer 1500W RMS D1 or D2

SoundQubed HDX3 18" Competition Subwoofer 1500W RMS D1 or D2

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If you want an 18" subwoofer that can bring real low-end authority while still staying efficient and controlled, the SoundQubed HDX3 18 is built for that kind of setup. This heavy-duty competition subwoofer is made for customers who want strong bass, serious output, and a subwoofer that can make the most of real amplifier power. With a made-in-the-USA dual voice coil and a design focused on efficiency, control, and cooling, the HDX3 18 is a strong choice for hard-hitting daily systems and serious bass builds alike.

The HDX3 can handle 1500 watts RMS and 4500 watts peak power, giving you a solid balance of real power handling and strong output potential. SoundQubed built this series with a thick top plate, high motor force, and a tight gap for a high-efficiency speaker design. The taller 4-spoke cast aluminum frame makes room for a larger diameter spider for lower tuning and better accuracy, while the new roll profile helps achieve low-frequency performance without giving up control or power handling.

This subwoofer also uses a taller and wider surround for more precise excursion, stronger pulp-blend cones that are lighter than earlier fiberglass-laminate designs, and a thicker, more robust aluminum former with black anodizing. Double slit venting and a higher temperature resin are also part of the design, helping improve cooling, performance, and long-term durability when the system is pushed hard. If you are shopping for an 18" competition subwoofer, SoundQubed 18" sub, HDX3 18, or a dual voice coil SPL-style woofer that can play low and stay strong, this one checks the right boxes.

For system design, the HDX3 18 is offered in D1 and D2 versions and uses a 3" voice coil, 300 oz magnet, 36 mm Xmax, 10.5" mounting depth, and a 16 9/16" cutout. The recommended ported enclosure range is 5 to 7 cubic feet, giving you room to build around deep output and strong low-frequency response.

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