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Nicam is a system used for analogue broadcasts. If a TV is Nicam-capable (and they virtually all are these days, apart from the odd portable set) then it can receive these. If a set is just a Nicam set, then it is just stereo. If it has Virtual Dolby as well, then it can provide you with surround sound from 2 speakers (but it doesn't compare to separates).
The sound on the 6515 is very good for a TV set and the Virtual Dolby is one of the best I've heard. The picture was also sharp and colourful with a nice contrast range. However, that's where the nice stuff ends, unfortunately. I had two 28PW6515s and sent them both back. Both sets had the worst geometry I have ever seen in my life (including an interesting wavy picture during panning shots and tremendous bending towards the right near the top of the tube). The second set also made loud popping noises throughout the entire duration of the set being on (so loud, it used to make me jump!), and all four corners of the picture were blurred. As far as I could ascertain, these problems are caused by bad set design rather than just a bad batch or anything like that.
As Mitch has said, you'll find lots of comments and experiences about this set on the forum.
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