What is "6S/2C system"? 6 speakers 2 channel set up. Advantages, pros and cons. All Analog no DSP.

How to set up using 6 speakers playing 2 channel music. It is not multi-channel. It is only 2 channels. There is no special equipment. Only three amps each with volume control and a preamp to drive all of them. Plus the origin of it.
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