People only have two ears, why do you need 5.1, 7.1 channels, or even RADIUS in the SPATIal audio?
Whether it is stereo, 5.1 or 7.1, it is surround sound (Surroundaudio). Each channel in the audio corresponds to a physical speaker. Surround audio has been around for many years, and from the perspective of speakerlayout, its development is spatially (spaTIal):
Traditional two-channel stereo
One mimics the sound from your left, one that mimics the sound on your right.
5.1 audio
A few years later, 5.1 audio appeared, the audio was expanded in the horizontal direction, and there was no layout speaker in the vertical direction.
(three in front, one on each side, one speaker on the back = 6 speakers = 6 channels)
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