Greetings. I'm spec-ing out a new monitor...and I think I have it narrowed down to two choices. Both have HDMI/DVD-D/D-Sub connections and integrated speakers (which I know are probably crap and I'd have to disable and bypass). However, one has Audio Output: SPDIF and the other does not. What would one use that for?? Is that the only way to get around the monitor's integrated speakers and use other speakers? Many thanks!