ZETHUS-A18SPW | 18" 1600W Powered Line Array Subwoofer with Class-D Amplifier, DSP Presets, Birch Plywood, Black

The Sound Town ZETHUS-A18SPW is an 18" high-output powered line array subwoofer engineered to deliver deep, impactful low-frequency reinforcement. It features a heavy-duty 18" transducer with a high-temperature 4" voice coil, powered by an efficient 1600W integrated Class-D amplifier. The integrated DSP includes five factory presets, allowing quick frequency curve optimization options for different venues and system configurations. The ZETHUS-A18SPW features a rugged, internally braced birch plywood enclosure with a durable textured finish that minimizes resonance and unwanted vibration. It is equipped with professional PowerCon connectors for secure power linking, along with XLR/Combo inputs and dual Ethernet ports that support system monitoring and multi-unit linking for scalable setups. Serving as a low-frequency foundation for ZETHUS-A Series line array systems, the ZETHUS-A18SPW supports flexible system configurations. For ZETHUS-A26PW and ZETHUS-A28PW, the integrated M20 threaded socket enables connection with the ZETHUS-A26FF or ZETHUS-A28FF frames (sold separately) using the STSD-MM1449B pole system for satellite support. For ZETHUS-A210PW, the subwoofer can be directly stacked for ground-stacked and flown array setups using the ZETHUS-A210FF flying frame or ZSCB-A18S caster board with 4" wheels (sold separately). FEATURES ZETHUS-A18SPW HIGH-OUTPUT POWERED SUBWOOFER: Features a premium 18" woofer with a 4" voice coil, powered by an efficient Class-D amplifier delivering 800W continuous / 1600W peak output for deep, impactful low-frequency performance. SMART DSP TUNING: Integrated DSP with five factory EQ presets allows quick optimization for different venues and system configurations, delivering consistent, professional-grade low-end response without complex manual tuning. CONTROL & LINKING CONNECTIVITY: Dual Ethernet ports enable multi-unit linking and system monitoring. XLR/Combo inputs and PowerCon connectors ensure secure, reliable connections and streamlined system integration. FLEXIBLE SYSTEM INTEGRATION: Designed as a foundation subwoofer for ZETHUS-A Series line array systems. Provides consistent bass reinforcement for systems utilizing ZETHUS-A26PW or ZETHUS-A28PW loudspeakers. When used with ZETHUS-A210PW loudspeakers, the subwoofer supports direct integration for both ground-stacked and flown array configurations. TOUR-GRADE CONSTRUCTION: Built from reinforced birch plywood with a rugged textured finish and heavy-duty grille, reducing resonance and protecting internal components for reliable performance in demanding environments. SPECIFICATIONS Specifications Model ZETHUS-A18SPW Active / Passive Active Frequency Range 35 Hz - 200 Hz Frequency Response 35 Hz - 200 Hz Sensitivity 98 dB SPL Max 132 dB Dispersion Omnidirectional Configuration 18" High-Performance Powered Line Array Subwoofer Transducer LF: 18" woofer, HF: -- Voice Coil 4.0" Magnet 145 oz Impedance 8Ω Power Handling 800W RMS / 1600W Peak Enclosure Material High-grade 100% birch plywood Mounting Hardware M20 pole mounting socket Finish Texture coating Grill & Rigging Component Steel with anti-corrosion coat Amplifier Class-D Input 1/4" & XLR combo Output XLR thru. Out Signal Processing Polarity Switch, DSP Presets Control Volume Indicator Signal Voltage 100V-240V (50-60 Hz) Crossover Parts# -- High Frequency Driver Parts# -- Low Frequency Woofer Parts# -- Dimension & Weight Product Width (in.) 28.0" Package Width (in.) 31.9“ Product Height (in.) 21.7" Package Height (in.) 25.6“ Product Depth (in.) 20.1" Package Depth (in.) 24.8“ Product Weight (lb.) 105.0 lbs Package Weight (lb.) 126.5 lbs   Warranty/Certifications Manufacturer Warranty 1 Year   DOWNLOADS ZETHUS Series Brochure