The Sound of the Theatre which comes with 5.1 or 6.1 DOLBY DIGITAL PRO LOGIC SOUND in the home itself is called Home Theatre System. This is only the SOUND not the VISION (Video Display Device)
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The main components of the Home Theatre System includes mainly DVD PLAYER, A/V RECIEVER, SPEAKERS, SUB-WOOFER.
You will get the dought... why TV, Plasma or LCD will not include in the home theatre components? Yes, you are right without Video Device where we can see the Video. Ofcourse, we should have the Video Device (TV/LCD/Plasma) along with that we need have the effect of Theatre, So we need to buy the components of home theatre where we enjoy the Digital Sound in the HOME.