The specs indicate that the audio will transfer to hdmi device if using a mid 2012 (or later) MacBook. Will it also work with an iMac (late 2012)?

I need to connect iMac computers (late 2012 models) to Smartboards via HDMI cable. The audio seems to work with older iMacs with 10.8.3 using the hdmi adapter that I have (not Belkin) but not with the newer iMacs running the 10.8.3 or higher.

Belkin 4K Mini DisplayPort to HDMI Adapter

Belkin 4K Mini DisplayPort to HDMI Adapter

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