Differential Line Level Audio Multiplexing

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Dear All,

I am developing a raspberry pi based car infotainment system. My stock amplifier has 5 differential inputs. The amplifier itself has crossover integrated. I would like to use TI based dac, something like 1794.

I would like to divide differential output o 5 differential output, 2x stereo + 1 mono (subwoofer). How can divide these outputs and volume control for each output as well. I prefer the volume control done with I2C supported chip since I wont have chance to place any mechanical pot.

Can you please suggest me ideas and if possible similar projects to undertand how can I do it?

Another thing is how much should I amplify my source level?

Thanks
 
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