You could try one of these:
»www.amazon.com/Philips-S ··· 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.--
University of Southern California - Fight On!