SoundQubed HDX4 18" Competition Subwoofer 2000W RMS D1 or D2

SoundQubed HDX4 18" Competition Subwoofer 2000W RMS D1 or D2

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If you want an 18" subwoofer built for real low-frequency authority, the SoundQubed HDX4 18 is made for exactly that. This dual voice coil competition subwoofer was developed to play lower, stay efficient, and deliver stronger performance in the frequency range many real-world vehicles and modern music demand. It is a serious choice when you want deep bass, high output, and a subwoofer that can make the most of amplifier power and electrical support.

The HDX4 line builds on the HDC platform with improved low-frequency performance, increased excursion, and stronger overall durability. The cast basket allows for larger diameter spiders, giving the suspension more room for cone and spider travel while also improving airflow and heat dissipation. It also uses spiders with more and higher rolls to increase freedom of movement and lower Fs, along with a higher surround profile to reduce material stress while increasing excursion.

Strength matters just as much as output, and the HDX4 18 is built with that in mind. It uses a fiberglass-reinforced pulp cone for added rigidity, a non-press cone formation process to increase cone wall cross-section without unnecessary mass, and high-quality American-made voice coil wire and adhesives to increase the thermal working range of the coil. Thicker black-anodized aluminum formers are also used to improve thermal transfer from the coil wire.

If you are shopping for an 18" competition subwoofer, SoundQubed 18" sub, HDX4 18, low-frequency SPL subwoofer, or high-excursion dual voice coil subwoofer, this model checks the right boxes. The HDX4 18 is rated at 2000 watts RMS and 6000 watts peak power, uses a 4" voice coil, a 403 oz motor, 31 mm Xmax, and is offered in D1 and D2 versions. The recommended ported enclosure range is 5 to 7 cubic feet, giving you room to build around strong output and deep low-end response.

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