This Emerson EWC27T4 set is equipped with a single audio out on the back bottom (red). It is stated that this apparently only works with the DVD audio, this is weird but OK. However I cannot get it to make a peep! I have a speaker that was tested with another audio source and it functions. It doesn't work here. I have tried other audio devices with no luck. I can find no where that says I have to physically activate it which would be OK too. Any ideas?