Product Overview
The SoundQubed HDX4.2-18D2 is a competition-grade 18” subwoofer built to deliver crushing bass, unmatched power handling, and long-term reliability. Rated at 4000W RMS and 16,000W burst power, this dual 2-ohm powerhouse is engineered for high-output systems that demand deep, clean, and punishing low-end. With a sensitivity of 90.4dB and a resonant frequency of 31.7Hz, it offers efficient, ground-shaking performance with impressive clarity. A massive 402 oz magnet, 4” high-temp voice coil, and 23mm Xmax allow for extreme excursion and heat dissipation. Designed for ported enclosures between 5 to 7 cubic feet, the HDX4.2-18D2 is the ultimate choice for competitors and bass enthusiasts looking to push the limits of what an 18” sub can do.
