Ted
Whoops, don't think I answered your precise query.
They are hooked up as follows: 1/4" leads from Main Out L & R to the mixer Line In L & R.
1/4" leads from Mixer to each of the Behringer Monitors.
With each speaker having a 150 watt Woofer and a 75 watt Tweeter, I have the keyboard volume way down low, but the clarity is brilliant.

Keith