The Electro-Voice DML-2181A is a high-performance subwoofer designed with Manifold Technology®, featuring two 18-inch woofers facing into a central manifold chamber that increases acoustic loading for enhanced low-frequency efficiency and reduced distortion compared to conventional designs. It operates efficiently in the 36-100 Hz frequency range and is suited for high-level sound reinforcement in touring and permanent installation applications. The subwoofer integrates a dual-time-constant compressor circuit that reduces peaks and average levels to protect the loudspeaker and prevent amplifier clipping while preserving audio dynamics. It has front panel LED indicators to show drive signal levels, compressor gain reduction, and thermal, excursion, or amplifier limits.