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None that I'm aware of, except the pioneer amps I mentioned (I'm almost positive they took a digital input). ODR or Optical Digital Reference was what the system was called. It consisted of a headunit, eq/dsp, and specific amps. Sony also had a similar system, but I don't know if it was digital.
Alpine does have a "theater" amp that takes optical in, but it's for a 5.1 system and not very high powered.
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