Hi Jaco,

Thanks for the rear picture of the unit.

The traces on the back of the board are telling. I'm about 99% sure those are DACs.

If you look carefully you will see that there are three traces with vias at basically the location of each mystery chip. Looks like they basically come up under the mystery chips based on the two vias a little to the left of the traces which can be seen on the top picture of the board.

Looking at the traces the same three signals are fed to those chips. It is a good bet those are master clock, bit clock and L/R clock. There are also 4 traces with each one going to one chip alone. That is likely the serial data lines for each pair of channels.

Thanks,

Shawn

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