The SONAR 115 Sub D is a powerful, state-of-the-art powered subwoofer for extending the bass response of SONAR full-range models, but also many other types of speakers. The particularly powerful 15? woofer, the 1500-watt power amplifier and the meticulous HK Audio acoustic engineering guarantee an impressively powerful bass experience. The SONAR 115 Sub D is controlled by a 24-bit DSP with an illuminated LCD screen, which can be used to conveniently adjust the crossover frequency, polarity and, if necessary, the delay. One particularly remarkable feature is the easy-to-use, highly efficient Cardioid feature, which up to now has only been available in much higher priced subwoofers. Thanks to the two pre-configured CARDIOID FRONT and CARDIOID REAR presets, problematic rear bass radiation can be effectively minimized.