@PeteS - i tried a couple if times to get a definitive answer for you but the line6 specs were flakey....
Pete, you might want to consider sometime in the future investing in very good cans... my preference is open back AKG Q701 they are superbly flat. and a sound stage to Dream for. I hardly use my mid field monitors. Speakers and cans can play tricks in what is actually going on frequency wise in a mix, so be prepared to find out the difference between the 2 listening environments.
There are other great open back cans available too.
The mic pres on the behringer are really good, but a valve pre will make em sound just great, not just good. But thats for the future.
I wish you well Pete , let me know when you are able to connect it all up.