King Prat and Grant: I'd suggest to the camp that the speakers be "aimed" away from the lakefront towards the camp itself.
But Grant's experience is reminding me of the occasions I rent on Lake Wentworth while my Winnipesaukee place is rented out [a net-gain, at double Wentworth's rent].
At mid-morning, the nearest girls' camp there sounds like banshees have attacked!
No loudspeakers, just a hundred exuberant girls a ½-mile away!
Anyone planning on buying lakefront (or maybe anywhere near a camp) needs to experience this phenomenon first-hand.
