SOUND TOWN ZETHUS-M115SPW 15' POWERED SUBWOOFER: The Sound Town ZETHUS-M115SPW subwoofer features a 15' woofer with a 4' voice coil and powered by class-D amplifier capable of 700W continuous, 1400W peak power BUILT-IN DIGITAL SIGNAL PROCESSOR (DSP): Take complete control of your sound and music with the built-in digital signal processor (DSP) on the ZETHUS-M115SPW. It features dynamic bass enhancement, RMS dynamic processor, 2nd order IIR filter, and 4 digital EQ presets, allowing you to fine-tune and customize your audio for optimal results SEAMLESS INTEGRATION: Easily stack and lock ZETHUS-M3PW full-range powered line array speakers (sold separately) directly onto ZETHUS-M115SPW subwoofer or using the ZETHUS-M3AD subwoofer speaker pole (sold separately) for ground stack setups