Through Downfiring (subwoofer on the bottom) this subwoofer, with a frequency range of 20-200 Hz, produces more bass sound. The crossover frequency is adjustable between 50 ~ 150Hz. The subwoofer takes care of the frequencies below the set value and thus relieves the other speakers in the system. The phase is to adapt, where you can choose from 0 ° or 180 °. The stereo RCA input or standard speaker terminals can be connected to a receiver or amplifier. The subwoofer rests on four legs. Active system with 25cm (10 ") subwoofer for 200W max. performance. Downfiring subwoofer in a heavy, low resonance chassis for clean bass. Phase control. Bass reflex design. Adjustable crossover frequency for optimal sound quality.