Solid as a rock, this super-affordable passive subwoofer is the definitive authority for augmenting your overall sound with a massive bottom-end kick. Any PA application can benefit from an infusion of some healthy low-end grunt. With a mighty 18" bass driver howling inside, the X in the E1800X not only indicates the built-in, switchable crossover for bi-amping applications, it also definitely stands for “extreme,” and for a good reason! With a high sound pressure level (99 dB half space 1 W @ 1 m) and a 45 Hz - 300 Hz frequency range, the “X” is only fitting. Plus, there’s nothing skimpy here: there are reshaped handles for easy transport and a rugged steel grill for optimal speaker protection. The whole package is ruggedly constructed for extreme longevity and durability.