The J&M Self amplified speakers are a much better buy, IMHO. VERY good quality and easy volume controls. Push buttons that are reachable with your left thumb, you don't have to move your hand off the handlebar or even look at the speaker. A much better configuration than the Kuryakyn's which you have to do both.
I powered the J&M's through the accessory switch on my RK, so I could turn them off when I didn't want to listen to any tunes.
:USA