No you don't "have to." Just be sure the Oppo's "Downmix" setting in the setup menu is set to "5.1 CH," and that you go through the speaker size and distance settings. Set the speakers to "small."

Holy COW! Those prices at monoprice.com are amazing. Almost makes me wish I bought my cables from them for the price. I wonder how they compare to bluejeanscable speaker cable.

ok..when the cables come i will try that and let you know the results.....so far i have done autocalibration and the sound is much improved.....pleased with the performance