ZETHUS-218SPW | ZETHUS Series Dual 18" Powered 3200W Line Array Subwoofer with 2-Channel Class-D Amplifier and DSP, Birch Plywood, Black

The ZETHUS-218SPW is a powered dual 18" line array subwoofer designed for high-output low-frequency reinforcement in professional sound systems. It features dual 18" woofers with 4" voice coils and a built-in 2-channel Class-D 3200W amplifier for strong, controlled bass performance. Integrated DSP provides system tuning flexibility with a switchable low-pass filter (40 Hz–180 Hz), dynamic bass enhancement, RMS dynamic processing, 2nd-order IIR filtering, phase control, and four EQ presets. Connectivity includes (2) XLR-1/4” combo inputs, (2) XLR thru outputs, and (2) XLR 100 Hz high-pass outputs for integration with full-range systems. Constructed from all-birch plywood, the enclosure minimizes resonance and unwanted vibration even at high operating levels. Reinforced hardware and rugged cabinet design support touring and permanent installation use, while multiple side handles improve portability. Dual M20 pole mounting sockets provide flexible horizontal or vertical mounting configurations for varied system deployment needs. The ZETHUS-218SPW integrates with ZETHUS-210BPW full-range powered line array speakers for scalable system configurations. Ground-stacked setups can be deployed using the optional ZETHUS-SF1 mounting frame, while the optional ZSCB-218S caster board (sold separately) supports mobility and transport. Suitable for live sound venues, clubs, houses of worship, auditoriums, and installed sound environments. FEATURES DUAL 18" POWERED LINE ARRAY SUBWOOFER: Features dual 18" woofers with 4" voice coils and a 2-channel Class-D amplifier delivering 1600W continuous and 3200W peak power. INTEGRATED DSP CONTROL AND CONNECTIVITY: Built-in DSP with switchable low-pass filter (40 Hz–180 Hz), dynamic bass enhancement, RMS dynamic processing, 2nd-order IIR filter, and 4 EQ presets for flexible system tuning. Connectivity includes (2) XLR-1/4” combo inputs, (2) XLR thru outputs, and (2) XLR 100 Hz high-pass outputs for system integration. TOUR-GRADE BIRCH PLYWOOD ENCLOSURE: All-birch plywood cabinet minimizes resonance and unwanted vibration even at high output levels.  PORTABLE & INSTALLATION FLEXIBILITY: Includes dual M20 pole mounting sockets for flexible horizontal or vertical mounting configurations. Multiple side handles allow for easier transport. Optional ZSCB-218S caster board (sold separately) enables ground stacking and mobility.  SYSTEM EXPANSION & INTEGRATION: Compatible with ZETHUS-210BPW full-range powered line array speakers (sold separately) for complete line array system configurations, including ground-stacked setups using the ZETHUS-SF1 mounting frame (sold separately), enabling scalable deployment. SPECIFICATIONS Specifications Model ZETHUS-218SPW Active / Passive Active Frequency Range 27 Hz - 180 Hz Frequency Response 32 Hz - 180 Hz Sensitivity 104 dB SPL Max 135 dB Dispersion Omnidirectional Configuration Dual 18" active line array subwoofer Transducer LF: 2 x 18" woofer, HF: -- Impedance 2 x 8Ω Nominal (bi-amp) Power Handling 1600W RMS / 3200W Peak Enclosure Material High-grade 100% birch plywood Mounting Hardware Integrated line array hardware M20 pole mounting socket Finish Texture coating Grill & Rigging Component Steel with anti-corrosion coat Amplifier Class-D amplifier (2-channel bi-amped) Input 2 x XLR-1/4" combo Output 2 x XLR (thru), 2 x XLR (100 Hz high-pass) Signal Processing EQ Presets, Polarity  Control DSP, Phase, Sub Level, LPF Indicator Signal limit, DSP1, DSP2, DSP3, DSP4 Voltage Neutrik PowerCON in & out 100V-240V (50-60 Hz) Caster Board Model# ZSCB-218S Dimension & Weight Product Width (in.) 45.3" Package Width (in.) 50.8" Product Height (in.) 21.7" Package Height (in.) 28.0" Product Depth (in.) 30.6" Package Depth (in.) 36.2" Product Weight (lb.) 272.0 lbs Package Weight (lb.) 284.2 lbs Warranty/Certifications Manufacturer Warranty 1 Year DOWNLOADS ▶ ZETHUS-218SPW User Manual (V1), discontinued ▶ ZETHUS Series Brochure