I will set the base starting specification as: 256 bit @ 200 mega samples per second | per channel, which is [200 Mbits/s], + filter above 20-22kHz.
If you wanted to support 10 total channels you would need a 2 Gbits/s [RGB Optical] input (+ packets bits if used).
Stereo (2 channel) PCM, 256 bit @ 200 Ms/s = 102.4 Gbits/s, 51.2 Gbits/s mono.
----
No ADC, no DAC, no analogue amp, no pseudo samples. A RGB Optical mic, could be directly plugged into a speaker, as long as it has power.
Note, the DMAS uses an alternative form of PCM, still code, but code produced from 255,255,255,X, more directly.
====
In terms of the input, if there where 10 channels, there will be 10 individual colour-lumen pulses (bits) + a nil (e.g. white-bright, 11 total bits).
This produces 10 positions for 10 speakers with the same sample interval, channels default to: 1,2,3,4,5,6,7,8,9,10 +.
The second image below would be 8 bits, with off specifying a 0 sample, 0 volts.
----