This goes for just about every soundbar out there, too: make sure the player is hooked up using the best possible connection available directly to the soundbar, and ensure the highest supported audio tracks are set for output (my experience shows some Soundbars only supporting DTS/Dolby Digital over HDMI, instead of the lossless DTS-HD MA/Dolby TrueHD soundtracks; ALWAYS check your manual!). The soundbar's processing will take care of the rest, provided you set it up according to the manual that came with it.
Adjustments to speaker positions within the player itself should only be handled by you if you're in an entirely analog audio setup (few people are, nowadays); otherwise, your AVR or Soundbar will do the heavy lifting for you.