You know those are artificially generated fake rear as pretty much only sound files pulled from blu-ray concert contains true multiple sound channels.
Pretty much all the newer surround sound receivers have auto adjustment features to account for a large room environment with varies different sound reflection properties to adjust for furnitures, wall material, curtains and such which can vary but a large degree in very home. But you don't really need it in a small cabin in a car which is basically a fixed environment, especially since most of the modern car sound system already take that into account.
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