The Athena AS-P4100 is a sub-woofer with a 10" downward facing driver powered by a 100 W amplifier with a peak power rating of 400 W. It has dual vented ports: one facing downward, and the other facing outward. It has a variable low-pass cut-off point set between 40 - 120 Hz and the sub-woofer itself has a reported frequency response of 23 - 120 Hz (+/- 3 dB). There is a auto-on/auto-off convenience feature that powers the sub-woofer automatically in the presence (or lack of presence) of an audio signal.