E4 the KMTs are a power hungry speaker pod. They really want that power off the 450.2 and yes you can hear them pretty well at wakeboard distance. Surprising well for non HLCDs. You do have to be careful on the cross over frequency as they don't like Bass at all. The woofer will over exert and be damaged pretty easily.

I think the popular choice is the WS420 i think its called.

I use a separate volume control for the tower itself so i can kill the tower when my rider falls but keep the boat cranked up while coming back to get them. Then i hit the mute on my stereo still they are back on the water.