If in 5.1 just listen in dolby digital mode. If in stereo Dolby surround to get your center channel. Your receiver might also have a surround emulator for two or 3ch setups, you can try it and see if you like it or not.
Make sure you set up your cable box to output dolby digital, most of them are set to output PCM by default, which is down mixed to 2ch by default. As for speaker setup, set them all to small. 80hz is a good crossover point but you need to make sure your speakers are actually capable of 80hz. For example, my L/R and surrounds are all capable of 50hz -3dB, they're set to 80hz because my sub is much better at reproducing stuff below 80hz without distortion than my speakers. My center channel is only capable of 85hz, so I set that to 90 hz.
Just look up the specs for each of your speakers and be sure to set the crossover at least 10hz above their low end response. Try to avoid crossover points higher than 100hz if you can though, since it will reveal the location of the sub.
It's also important to properly set the distance of each speaker relative to the MLP. Audyssey should do this for you. I personally am not a fan of automatic room correction, but since you're a newbie it's probably best for you. Just double check the distances.
When using audyssey, you want the first measurement to be taken directly in the center, even if the seating is off center. Place it in line with the center channel. The other measurements should stick to about 3 feet from the first measurement. Make sure after you run the Cal you disable dynamic eq to check the results.
As for biwiring, it does nothing except waste wire. Passive biamping might have minor benefits with respect to intermodulation distortion, and it does increase the total available power to your speakers. To be quite honest though your center channel probably needs more help than the mains, since it carries over 60% of the soundtrack. Either way, biamping won't hurt anything and you've got the free amps to do it so feel free to experiment.
I find a manual calibration gives much better results though, and requires nothing more than a tape measure, REW, and cheap spl meter. The receiver should have manual EQ settings. Most spl meters are accurate on the low end, and quite frankly applying eq to high frequencies is a waste of time. If you're ever interested in manual calibration feel free to PM me.
Have you considered mounting surrounds on the wall? Why would it need to be wireless? Heights could also be wall mounted above your fronts.
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