The diagram below is a simplified representation of the signal flow through the miniDSP Flex Eight (without Dirac Live):
The audio signal flows from left to right in the above diagram:
One of the four stereo input sources is selected by the user.
The selected stereo signal is passed through the input channel processing blocks: level metering, input gain, parametric EQ and FIR filtering.
The processed input channels are fed into a 2-in 8-out routing matrix that routes/mixes the two processed input channels to the eight output channels.
Each output channel runs a comprehensive set of DSP functions: parametric EQ, crossovers, level metering, delay, output gain and compressor.
The combination of the routing matrix and the crossover blocks on the output channels is what gives the miniDSP Flex Eight the ability to be used in many different system configurations.