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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

128x128rubinken
tecknik
483 posts
 
Let it burn in for 400 - 500 hrs then see how it sounds. Relax, enjoy the burn in.
audioengr
3,282 posts
 
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.
rubinken's avatar
rubinken OP
102 posts
 
It seems that I have to wait patiently as it burns in for hundreds of hours. Hopefully that will warm it up to a much more pleasant sound. Hopefully...
Thanks for your respnses
chayro
2,990 posts
 
I have never heard the words Accuphase and harsh used together.  That is very surprising.  If you have a return option, I would let it burn in for just under that period and return it if it doesn't get better.  
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