HDMI carries the audio signal so there's two ways.
1. Plug all the systems into the sub and have one HDMI from the sub to the tv. Like I said earlier this will result in the systems being on one input thus having all the same calibration on the tv. This will also rely on the soundbar being the component switcher.
2. Plug them all into the tv and use your tv out to have one HDMI to the sub. This will let you have a different calibration for each console (something I feel is necessary, again just being anal) and you will rely on the tv for component switching.
If using a Wii that's a bit of an odd duck. You would use your component cables to hook it to the tv and use an optical cable from the tv to the sub. You would still need to manually switch to the Wii through the tv this way (and then switch the source on the sub to "tv") but it's the only way to add it to the soundbar.
Also remember to turn down the tv volume when the soundbar is on or you'll get an echo effect. Lots of tv's have an option to mute the set when an external audio source is detected. Iirc on the SONY series there's one kind of audio it won't play unless you use an optical cable, otherwise it just defaults down to regular stereo. I can't find the info right now but if I do I'll post it up.
There's also the issue of getting the consoles configured correctly so spend time at the AVS forums in their soundbar section.
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