Originally Posted by reecew /forum/post/18177616
Piece of hose, while playing the sub put one end into your ear the other around whatever areas you want to check. I will make and audible "whoosh" noise if you have a leak.
Originally Posted by FastForward763 /forum/post/18177951
This or a stethoscope. Playing sub 20hz test tones while doing this will make things even easier to hear.