really?  it's really hard to believe.....AFAIK, Samsung's TVs have relatively weaker sound as compared to other brands' TV

I am satisfied with my Panasonic P50U

hmm, last time when I bought my HDTV the best sound I heard so far is the ZV model, i tried samsung the sound is too bright for me, sony also not bad & of coz this is 1yr plus back

The best simply does not mean going loudest as normally loud and thrashy sound causes high levels of fatigue to the ears.
Even a small transistor can be turned up loud but because there is a lack of power there are high levels of noise mixed together with the signals makes listening for extended periods difficult (of course I am only talking about normal people and not those that like to blast their ears off because strictly speaking they have already lost a lot of their sensitivity and thus wouldn't know the difference).
I mentioned ZV because it has relatively powerful sound across the frequency range with a slight boost at the higher and lower regions for movies (probably caused by the audyssey tuning)
If loudness is the gauge of best sound then we would be better off just buying some cheap pasar road amp and speaker instead of investing in proper hifi / av stuff.

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Added on April 6, 2011, 11:52 am

Auto volume or whatever name different TV companies call them are actually a compression function that basically takes away all the dynamics in the sound thus making loudest and softest passages seem like they are at the same loudness. This is fine if you are happy with just listening but if you want to enjoy the movie like the director meant for it to be heard you have better turn it off.