It should be noted that I have not purchased this TV. I did spend several hours comparing the two versions at Best Buy and this is what I found:
The B650 has a MUCH clearer picture. And by "clearer", I mean more defined with a sharper contrast, brighter whites and darker darks.
I attribute this to the doubling of the contrast ratio. The A650 has a 50,000:1 whereas the B650 has 100,000:1. For those that do not know about contrast, the contrast ratio measures how many stages there are between the darkest dark to the whitest white a crystal can do. The problem is that the manufacturers do NOT use the same standard for what "dark" really is. Additionally, their darkest dark is measured when the tv is OFF - not very helpful since you're not seeing how dark the crystal can actually get. The B650 looked like a HD set while the A650 looked like a regular flatscreen.
I had the salesman put both tvs with the same settings to compare the two realistically. I also looked for the motion and "ghosting" that occurs when action is moving. For this test, I looked closely at a soccer game being displayed on the two tvs. Again the B650 did not show quite as much "trailing" that the A650 did. Although both sets were 120hz, the B650 out shown the A650 hands down. The response time (how long the crystal takes to go from white, to dark, back to white again) for both of these sets is 4ms; but the B650 seemed to have a much more fluid motion - much like if you were watching real life.
I am going to hold out some more to see if the price of these go down, but I am definitely going to purchase the B650 instead of the A650. Honestly, the best way is to go to Best Buy and see for yourself. Don't be afraid to ask the sales people to adjust the color and contrast for you.
Hope this helps someone decide which version you go with.
It should be noted that not all TVs, although the same model are not created equal. If you can, get two TVs and keep the best out of the two.
By ebay8503
Amazon.com
Samsung LN46B650 Price COMPARE!!
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