The SR-218LF sits at the center of Theory's SR Series manifold subwoofer lineup, combining dual proprietary 18" 3,600W woofers with 4.5" voice coils in a robust, field-serviceable enclosure. Two large low-turbulence ports, five 20mm top hats across three surfaces, and twelve handles give it the deployment flexibility to anchor both portable touring rigs and permanent installed systems. It supports passive or self-powered operation and can be upgraded to powered configuration via a Theory SR Series amplifier kit. M10 fly points on all surfaces and anti-skid rubber feet enable safe stacking and rigging.
- Dual 18" 3,600W Theory low frequency drivers with 4.5" voice coils
- Passive operation requires at least 2 Theory Loudspeaker Controller amp channels
- Requires model-specific Theory-certified DSP loudspeaker processing
- Premium multiply birch plywood enclosure with poly urea paint coating
- 2 large low-turbulence ports
- Five 20mm top hats across three surfaces for full-range speaker pole mounting