PreSonus Eris Pro Sub 10

Eris Pro Sub 10 10-inch, front-firing, glass-composite, low-frequency transducer Front-firing, bass-reflex acoustic port Switchable highpass filter removes frequency content below 80 Hz from the full-range subwoofer outputs to the main monitors Momentary footswitch (included) bypasses the subwoofer, highpass filter, and Sub Out Input gain control (-30 dB to +6 dB, continuously variable), polarity invert switch, and ground-lift switch 170 watt (RMS), Class AB amplification for up to 113 dB SPL, with a frequency response of 20 to 200 Hz