I decided to try my hand at building a water proof (lol) sound tube , was lucky to get the pvc fittings and pipe free , 2 Pyle speakers and a Pyle 400w amp was $90 , the mounting brackets were $25 , in a perfect world I would have had schedule 80 fittings so that the thickness where the speaker screws go would be thick enough , I had schedule 40 , I had heard that with schedule 35 or 25 ??? the sleeve end of the fittings would slide over the 40 hub o.d. perfect , but I didn’t have or wanted to buy them , so I cut widths of the 6 inch pipe and put them over the sleeve ends to act as bushings for the mounting brackets and to increase the end for the speaker screws , I hooked it all up to a 12 volt supply and it sounds good , going to paint the tube black and leave the speaker covers white
