In other words it a vertical add-on, or a horizontal core component layer?

FORBES: More On The McKinsey Study: Integrating Into Workflows May Pay Off The Most

By incorporating these technologies, the listener's surround experience is dramatically improved, adding a vertical component to the horizontal soundfield of both 5.1- or 7.1-channel systems.

ENGADGET: Denon outs 2009 line of Blu-ray players, AV receivers and headphones