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If you're trying to say that after the age of 70mm, digital sound evolved to 5.1, that's correct, but it wasn't the only format, there's also 7.1 and alternative formats such as Auro 11.1 and digital sound on 35mm film also supported Dolby EX and DTS ES which added a matrixed center rear channel...

No, the reason for doing reflective speakers is that it's much more likely someone would be willing and able to place four speakers (in the 5.1.4 configuration) on top of their current floor-standing speakers than install speakers on their ceiling, especially those who have only a standard...