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You can do this in the Audio MIDI Setup built into recent editions of OSX:

1) Open up the Audio MIDI Setup application (located in the applications/utilities folder)
2) On the "audio devices" window that opens up you'll see a list of devices on the left and a little plus icon in the bottom left hand corner. Click the plus icon.
3) Click "Create multi-output device"
4) Add the different devices you need to this new device.

You're done, now you can send audio to this new device as if it were a single audio output.

You can change the name of the multi-output device if you want by double clicking on it.

You have to go into systems preferences and then select the output under 'sound'/'output', can also compensate for speakers being a bit out of synch by checking the 'drift correction' box in the audio midi set up window.

Tested and works with 2 bluetooth headsets (1 motorola and 1 Unotec WB Run)
source : http://apple.stackexchange.com/ques...oth-speaker-and-headphone-jack-simultaneously

Thanks for this- I read this a while ago and it's the most incredibly useful trick!
 
You can do this in the Audio MIDI Setup built into recent editions of OSX:

1) Open up the Audio MIDI Setup application (located in the applications/utilities folder)
2) On the "audio devices" window that opens up you'll see a list of devices on the left and a little plus icon in the bottom left hand corner. Click the plus icon.
3) Click "Create multi-output device"
4) Add the different devices you need to this new device.

You're done, now you can send audio to this new device as if it were a single audio output.

You can change the name of the multi-output device if you want by double clicking on it.

You have to go into systems preferences and then select the output under 'sound'/'output', can also compensate for speakers being a bit out of synch by checking the 'drift correction' box in the audio midi set up window.

Tested and works with 2 bluetooth headsets (1 motorola and 1 Unotec WB Run)
source : http://apple.stackexchange.com/ques...oth-speaker-and-headphone-jack-simultaneously

so indebted u bro!
 
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