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Extending the BeoCreate board with an additional stereo channel

Hello,

 

If I would like to use the BeoCreate board for a three way system, is ist possible to directly connect an Hifiberry I²S DAC to another output I²S of the DSP and use that for a more powerful woofer channel or an additional fake sourround speaker pair.

The GPIO connector on the DSP board provides additional I²S outputs on ports 15-21, so it should be possible to use them in a DSP program.

If that is possible, which board might be suitable and what else needs to be taken into account (like GPIO settings on the slave board or setting the slave board into I²S slave mode, when using the DSPs master clock.)?

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