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If I connect a Thunderbolt MacBook Pro to two Thunderbolt displays, would it output the sound from four speakers, i.e. 49 watts x2?

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Sound would only come from one at a time. You can pick which one in the Sound Options.

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Are you sure about this? That's a drawback in my opinion. – Bruno Nov 27 '11 at 17:12
Regardless of whether or not its a drawback, its the honest truth. – wizlog Nov 27 '11 at 17:23
Can you provide a link confirming this? – Simon Sheehan Nov 27 '11 at 18:06
here – wizlog Nov 27 '11 at 18:16
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Yes, by default, to only one display. You can create an aggregate device: http://support.apple.com/kb/HT3956 that uses both displays, but you cannot duplicate an output channel, so all that seems to let you do is configure which two of the four available speakers you want to use.

EDIT: ah, instead create a "Multi-output" device. And then it plays through both speakers. Stereo is a bit weird though. (You can include your MBP's speakers for maximum lollery) Annoyingly you can't adjust volume easily, though.

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