Yes they do, however, the speakers that are built into TV's tend to be "sheilded" for AV use. < they also tend to be crappy due to small magnet sizes>
might be an ideaWell if it's a "centre channel speaker",from a surround kit, you should'nt have much problem placing it close to the tv, as centre channel speakers tend to have smaller magnets in them and are usually sheilded just for this particular use. Now if you are using a Giganormous PA speaker, cause you have it just laying around... well that's another story.
Could you run a line level signal from your surround amp center channal output to the audio input on the tv? Then you'd just be using the built in speakers for the center channel. Or is it that this is a monitor only PLasma ?
Seriously, are pulling my chain?my second suggestion was to put in in the gap behind the tv on the tv cabnet, so my question is how good would it be putting it behind the tv, would it ruin the sound by putting it behind the plasma television