There is a guy in Phoenix AZ. that has 20's on his four wheeler and a unique stereo setup, but you wouldn't catch me anywhere near it.
It's a four channel stereo and each of the four wood box speakers are attached to about an 18 inch section of what looks like 3/4 inch conduit so they are at head height at each of the four corners of his four wheeler.
Dumbest looking POS you ever saw, but I guess he rides it around town.
I can't find the picture or I would post it.