I replaced the CS8412 by the CS8414 in my Counterpoint DA-10 and the result are very impressive.
The problem is the different format (I use an Adapter SOIC to DIL) and this chip is difficult to find in Europe.
Very interesting! Did you use the "Wildmonkeysects" loopfilter on the CS8412? What are the differences in sound between the CS1812 & 8414? Could you elaborate on that?
Never thought the CS8414 was better on redbook CD's (44.1 kHz sampling frequency)
I just compared the CS8414 with the CS8412 in my NON-OS KWAK-DAC. (AD1865N-K).
I can <B>NOT</B> confirm your findings; on the contrary bass is slightly less with the CS8414. But the other attributes you described are very similar to the CS18412.