Jglaser
Junior Member
So I have my two alpine type r 12 in a ported box under my back seat with 1.70 cubic feet of air space per side tuned to 36 hertz and I'm having this weird sound comin from the port like a flapping sound it sounds like I put a piece of paper in front of the vent it's not too noticeable but on lower freq you can hear it bad can't figure it out looked at sub it's not blown surrond was coming off reglued still making the sound is the port loose or is it maybe port noise if you could help me figure it out that would be great