The other answer provided by 'Parts-Express Staff' is not accurate and misleading, this subwoofer models incredibly well in a vented box according to BassBox and WBCD. For example, the FR is very flat in a 1 cubic feet box (net, excluding port, driver volume) tuned to 28 hz with a 3" dia. x 25" long port for an F3 of 26 hz. Yes, you'll need a few 90 deg. elbows to fit the port in the box but it is well worth the effort.