Presonus Eris Sub8 Compact Studio Subwoofer

8-inch, front-firing, paper-composite low-frequency transducer with high-elasticity rubber surround, Class AB amplifier: 100W peak (50W RMS) power, Input gain control (-30 dB to +6 dB, continuously variable), Continuously variable lowpass filter (50 Hz to 130 Hz), Defeatable highpass filter removes frequency content below 80 Hz from the full-range signal sent from the Eris Sub8 outputs to the main speakers, Left and right, balanced ¼-inch TRS and unbalanced RCA main inputs, Polarity invert switch, Protection: RF interference, output-current limiting, over-temperature, turn-on/off transient, subsonic filter, external mains fuse