The QSC KS212C cardioid subwoofer redefines low-frequency control by delivering a groundbreaking solution for bass management in both mobile and installed audio setups. As the world's first single-box powered cardioid subwoofer, it eliminates the common issue of wasted low-end energy radiating behind the speaker. At its core, a 3,600W Class-D amplifier powers dual 12" long-excursion drivers housed in a 6th-order band-pass enclosure, generating a remarkable 15dB more output in front than behind the unit. This design ensures the bass stays directed toward the audience, offering pristine low-end performance without interfering with stage sound or DJ setups.