REALLY THE PORT IF FOR 1 in the manual. do the math... its round in the manual convert to square. The pic is also not the right resolution. so it looks smaller than it is. Its 7"x4" 7" deep. the box was professionally built.... The idea of the thread was about robotunderground not my port..... MMM, some of my favourite low-cost subs. From what I found playing with them, a tad over double the recommended port area works best Installed a pair of these in an A4 Golf, on 400w and it was ridiculous for that power level. Yes there are very impressive, if i ever find another deal again i want 6