The CSP121 incorporates Fulcrum’s proprietary Passive Cardioid Technology™ to overcome one of the major challenges of many loudspeakers excessive rear LF radiation. Unlike active cardioid loudspeakers, Fulcrum’s passive cardioid technology does not require an additional amplifier channel or additional transducer to achieve its impressive low frequency directional control 10dB of rear rejection over the subwoofer’s operating range. Includes handles and M20 threaded speaker pole mounting plate for use in portable applications.