Bi-Wiring an onkyo 605 and polk tsi-400s

[Marquoz]

I feel pretty stupid asking this, but I've looked at the manuals, and I Want to make sure I am doing this right. (i.e. the manuals are next to useless)

The polk manual doesn't clearly mark which one is the high and low frequency, is the top one the high and the bottom low? or vice versa?

Also on the onkyo, are the surround backs the high frequency? and the fronts the low frequency?

Thanks for any help! Sorry to sound so stupid!