I am usually the first one in our office, by choice I promise. I like to start the morning off without headphones- as I know I will probably be wearing them all day. I don’t have any type of speakers, but what I do have is two Acer G257HU via HDMI and MiniDP to HDMI attached to my MBPr.
Today I learned you can aggregate output audio devices.
From Audio MIDI Setup, in your Utilities Folder
You can configure a Multi-Output Device, by hitting the “+” button per OS X usual.
Select the attached devices you want to be rolled into the device. You can also specify location of the devices, left/right or if they are independently stereo.
In this instance I selected the two HDMI monitors that have (albeit crappy) internal speakers. And now have music out of both monitors rather than the left OR the right.
I am also using Background Music which is a rad project over on GitHub by Kyle Neideck reminiscent of Rouge Amoeba’s old independent application audio mixer application, the name of which escapes me. You can see it as another output device as an option.
Quick switch between devices by Alt+Click ‘n on the Volume control in the menu bar.
Just a quick tip from something I wish I knew ages ago. Hope this helps someone.