The Electro-Voice ETX-15SP is a powerful powered 15″ subwoofer designed to give you the low end your PA needs. This powerful portable 15″ subwoofer features the latest Class-D amplifier technology with onboard DSP for ultimate flexibility to suit almost any application. The ETX15-SP features a strong durable enclosure made from 18mm thick 13-birch plywood which houses the DVX 15″ Woofer and powerful 1800W amplifier to deliver a solid and punchy bass response with a 134dB SPL output!