Accuphase DAC-50: Glaring sibilance


I updated the user slide-in DAC board from an Accupohase DAC-30 to the newest DAC-50. The brightness is way too harsh.
     The DAC-30 uses two Texas Instruments PCM1796 chips driven in parallel for each channel.  While the newest DAC-50 DAC uses AK4490EQ chips from Asahi Kasei Microdevices in a double parallel configuration per channel."

The only changed variable in my system is this updated, new DAC-50 placed into my Accuphase E-550.

Suggestions to minimize brightness are appreciated-
Any experiences with the DAC-50?    Will burn-in time help?     An outboard clock make sense?
Thanks, Musically, Ken

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Showing 1 response by audioengr

I'm sorry.  I did system evaluation of AKM D/A chips and never was able to make them sound musical.  I think it's due to the switched-capacitor filters in the design.  I used another chip for my reference DAC as a result.