You are both right, the 4493 do have a register for phase inversion, technically it should have been possible to access it by firmware update, but if Topping say they can't, it means they can't... What it means is that they only have possibility to update the XMOS firmware, and that for some reason the XMOS controller don't have FULL access to the dac chip registers. I have to say that this does surprise me a bit, since there is the possibility to switch the dac filters so there is a communication between the 2 chips, just partially, it is indeed strange because there is no cost for this, but I'm sure there is a reason why.I answered the question "did you confirm that's on all inputs or could it be just USB?" about the absolute polarity fix. Topping already made a firmware fix available to fix this for the usb input. This works on all E30's. Topping also acknowledged that the other inputs could not be fixed with firmware, (read earlier posts in this thread) so they would fix that in hardware. What did I miss? Your explanation seems not related at all to what I answered and not based on what Topping has said about this. If they could have fixed all inputs with a software change (according to your opinion) why would they make a hardware change then?
But one thing is certain (hence my earlier answer): Topping has fixed it for all inputs.
edit: I missed that part about stm mcu. So this Dac would use 2 micro-controllers? one for USB/DSD (XMOS) and one for communication with the AKM 4493 and 4118? That's interesting to me. It does make sense.
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