Connecting Macbook Pro to Emerson HDTV.... sound?

I just recieved an Emerson HDTV and am trying to connect it to my Macbook Pro.  By using an HDMI2 cable, I have picture.  But, I cannot get the sound.  I have plugged in an audio cable (don't know the name of it but it is the type that fits into the audio out jack and has the red and white connectors to the tv) but there is no sound.  When I can "sound output" in my preferences, it is not seeing the audio out.  Is there a specific setting I need?  Or does the Macbook Pro require a specific cable?  Thanks.

Check your MBP to make sure you have a miniDisplayPort and not a miniDVI port.
If it truly is a miniDisplayPort then monoprice has a miniDisplayPort-->HDMI cable and you don't actually need an adapter. Save yourself some $$.
For audio, you will need a stereo audio cable with 1/8" stereo male plug on one end (for your MBP) - the other end depends on what audio input your Sanyo has ... typically it's 2xRCA connectors (Right=Red, Left=White).
ps. you don't really need a 1.3a cable for this setup, you could save yourself some $$ with a 1.2 cable. I'd also suggest a longer cable ... 3' is pretty short.

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