jbl_marshall21 10+ year member
important person
i have 2 12's pioneer TS-W304C subwoofers in a sealed 2 chamber 3.8^3 box w/divider each chamber has 1.7^3. i want to port it. i want to tune it pretty low. maybe 33 or something like that. i need some spl. there is 190 watts going to each sub. pioneer recommends 3x7 port but that is for a 1.3^3 box, but my box is 1.7 so i need a bigger port right? my box is 36x16x13.5. should i buy the ports or make them out of pvc pipe?