I wish to buy a new DVD player, but I need help to understand those features listed to select the right player. Firstly, some player with DTS output and some mention DTS decoder, are they same? which one should I select if I need DTS feature? How about Dolby Digital & AC3? Do I need to select a player with Dolby Digital and AC3 decoder as well to play DVD with Dolby surround & AC3 sound?

Secondly, about amplifier, some of them with all this DTS, Dolby Digital & AC3 logo listed in their feature list. Do I need to match the same feature of my DVD player to work?

Any help will be much appreciated, TIA.