You could try one of these:
»www.amazon.com/Philips-SWS2103W- ··· 2&sr=1-3
Using the Composite Video/Audio outputs of the box should give you audio even when the HDMI cable is connected.
May be best to double-check by moving the 2nd TV into the same room and using a short composite cable before buying the modulator, though.--
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