Here is my DIY tower speaker project. Each pair of speakers, has (2) 8 inch Pro Audio speakers inside. One is coaxial and has a 1 inch titanium horn loaded compression driver (HLCD)mounted through it and crossed over at 3500hz. That pesky tweeter hole turned out to be a good place to mount a speaker wire connect/disconnect. I started with 4 8 inch aluminum cans: The red arrows show where I had to cut them. The driver hole was resized to 7.13 inches in diameter to allow the 8's to fit. The speaker grill retaining ring and driver are secured with 8-32 stainless machine screws. My goals for this project were to use Pro Audio speakers, have a very quick connect/disconnect with as little weight as possible on the tower (Each pair of speakers weighs only 24 pounds). Most of all, it had to be loud and sound good too. The speakers attach to the tower by knobs that screw onto the 3/8 - 16 studs coming out of the tower clamps. Neutrik Speakon Quick connect/disconnect audio connectors plug the wattage into the speakers.
They may look like everyone elses speakers, but these can be heard a long ways away. They are loud and sound great at 80 feet out and 30mph.