soundstreamer 10+ year member
Ω
Its a cut piece of PVC over the lip of the port. Seems to increase scores more often than not. It worked for me the one time I tried it...I should try it on my next box now that i think of it...is the pvc tube the port? or just a pvc tube at the bottom //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif