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As expected from a well-designed implementation of a pair of dacs to the board, while one chip deals with left side, the other focuses on right side. One 9028pro has 8 channels;therefore, the both must be benefiting from 16 channels. You have claimed the dx220 can use 4 channels at most. Is there anyone here presenting official diagram of engineering design like sabre’s official website suggests ( just google sabre es9028pro). If DX220 uses only 4 channels, this sucks!
Who said such that you asked above ?
Would you understand the Diagram ? Those you see in A&K or Cayin are simple diagram that doesn’t really mean anything. Unless you want official Schematic and you can comprehend it.....even so, why Should Ibasso disclose it if any ?
There are different cores in the ES9028Pros, and if fully implemented, you can control it via Software or Firmware. Maybe you can try asking our only 1 @Lurker0 here about what the core firmware is doing with ES9028Pros ?
Then, such questions should also be directed toward other TOTL such as SP1000/2000.....Sony DMP-Z1 as well....
Once again, the DAC-IC alone can not do anything by itself......