confused about dolby's 5.1.2 overhead speaker placement guide

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Dolby 5.1.2 Speaker Placement - coretodo

Kind of confused…Dolby AVR-X1800H manual doesn't mention “top middle atmos”. Is “top middle speakers” still atmos? And can I mount these speakers further back (closer to where we sit)? : r/hometheater

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Atmos speaker placement 5.1.2? : r/hometheater

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In 5.1.2are the height speakers in the front or the back? : r/hometheater