I'm not entirely sure if this is the best place for these questions, so if not the moderators can relocate please.

I am considering purchasing the following for a simple, small living room setup:

Sierra Tower RAALS x 2
Emotiva XPA-2
Oppo BDP-103

My questions are concerning the LFE channel. Can the Oppo redirect the LFE channel
to the 2.0 speakers? Also, will the relative volume still be "+10 db" compared to the main
channels? And finally, will this LFE channel possibly damage the Sierra Towers at "normal" listening levels? Do the towers have some sort of high pass filter in their internal crossover to protect from over excursion?

I'm neither an audio "pro" or "dummy" (if this helps). Thanks all!

(I've done some searching on these questions, but cannot find a very clear answer. I've looked in the Oppo manual, but could not find an answer. I was hoping someone here would have this player. Thanks!)