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8 x dac chip Cirrus Logic CS43198, 4 per channel, summed for lower noise and distortion. Like a pair for R+, another pair for R-, another for L+ and another for L- of the balanced outputs.
Apl HiFi used to do the stacking thing years ago when sacd was a thing. I think Alex is still around. I'm sure if you lookup that name he will have something crazy.