Anyone tried or currently bi-amping their front speakers using the back surround outlets as described in the manual? I assume this might also be possible with ax10 and ax3? I'm thinking about testing this. Did it lead to any sound improvements you think? If you haven't tested it or don't own an ax5 do you think that bi-amping always is an improvement. From reading about it it sounds like it always improves the sound, the problem is if it's so much better¨so it's worth bying a extra pair of ht pro-11..