Spiller box for mini display port

I need to get 2 screens working from my 2011 imac. The screens are hdmi I have a mini display/thunderbolt to hdmi cable and works fine on one screen but I've tried various hdmi splitter boxes but they won't see the mini display to hdmi cable. 
Cheers Antony

A video "splitter" does not work, you must use a video distribution amplifier like this:
HDMI DISTRIBUTION AMPLIFIER

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