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Actually Home theater sound, is 3D. (Three Dimentional) Your receiver, using surround speakers reproduces 3D sound.
i.e. It is Left to Right, and Front to Rear. Thus it's 3D. If your get a 3D TV, your sound will be just fine because it doesn't come from the set. The sound SOURCE is the DVD player, CD player or Cable Box. If you use digital audio outputs (optical cable or orange colored RCA cables) from these items connected into the Harmon-Kardon, your will get the full Home Theater sound. The Harmon Kardon does not have HDMI inputs however it will not need them for the purposes of sound. Your Receiver is a high quality unit. If you want the thrill of 3D TV, go ahead and get one. After you have set it up, if you then decide you want to go to 7.1 or some other SOUND upgrade, go ahead. One thing you should know, is that there is not a whole lot of audio quality improvement available after 5.1. Unless you have a very large living room. The real quality counts when choosing the speakers and sub woofer that go into the system, not the amount of speakers you have.
I have done a number of high end home theater installations and the experience of hearing the systems (mostly 5.1) has been a thrill for the owner.
I hope this helps you,
on Jan 20, 2011