Been working on a rotary speaker project.
I spent a while experimenting with drive bands and pulleys before settling on a coffee cone/dripper attached directly to the shaft of an old motor from a tape deck.
A paper cone sticks out the side of the coffee dripper
Using an old Fostex speaker.
I'm now thinking about how to finish the enclosure and mount the controls. I have a PC fan controller to adjust speed but it only has an affect from 12V down to about 6V - it needs to go down to about 3V for slow rotation. I might build a PWM circuit to control the motor.
Here's a video test drive: