It's not necessarily an HDMI out because it doubles as an HDMI input and HDMI audio output. The only thing it outputs is sound but works most often as an input and will be labeled as an input. For example, at my house I have all of my A/V devices connected to my receiver and one HDMI cable from the receiver to the TV so i can get my picture from my devices, so in this case the HDMI port on my TV acts as an input. Then when I stream content directly from the tv, that same HDMI port sends the audio information out of the tv to my receiver so I can get the sound that way. In this case, the HDMI port would be acting as an output, hence the reason it's called Audio Return Channel or ARC.
Samsungs HDMI 2 input is usually labled "HDMI 2 (ARC)" meaning it supports the output of audio from the TV to an external device, in this case the soundbar. If the tv does not say ARC anywhere on any of the HDMI inputs, then the set does not support that feature and they'll have to stick with using a fiber optic cable and toggle remotes or get a harmony remote.
If you list the model number of their TV, i can tell u right away if it supports ARC. Essentially if it's a new model tv F6300 or higher, the tv WILL support ARC, any model lower (e.g. F6030) will NOT support ARC. Remember to connect the HDMI cable to the HDMI (ARC) port on the TV and HDMI out port on the soundbar. Switch the input of the soundbar to "D - in" (which stands for digital-input) and wait a moment, the soundbar should then read "TV ARC". If that shows up, you should be good to go. If it does not list "TV ARC" then restart the tv and soundbar and it should work then.
If it's an F6400 series or higher, they can actually wirelessly output the audio from the tv to that soundbar as well (that's what Soundshare is). That would also allow them to control the volume of the soundbar with the Directv remote and save them some time and money if they don't have a spare HDMI 1.3 or newer around. However, they will sacrifice some audio quality if they transmit wirelessly to the bar, but to each their own.
Edited by maygit - 8/5/13 at 1:59pm