what is a qam tuner?
I was looking over some tvs at techbargains. Comparing the LN-S4051D to the LN-S4042H.
Aside from the higher contrast ratio of the latter (and the higher price), what is a QAM tuner? Do I really need it? They both have digital and analog tuners but the second set has a QAM tuner. What is that?????????