Accuphase DAC-50: Glaring sibilance

Hi Mark,
I had the E550. It sounded *phenomenal*- great soundstaging, transient response & emotionally involving.  I was driving some Consensus Audio Conspiracy speakers from Austria  They utilize six ceramic drivers with total smoothness. (After decades of listening, I feel that Ceramic drivers with Class A amps sounds most compelling to me. Somewhat of a generalization, but tis what it tis.) The phono board sounded excellent to me.  I never ended up enjoying the DAC50. I replaced it with a used AMR DP777SE, which with it's tubes serves me fine.
  I gave my E550 to my son. It sounds fabulous on his Sonus Faber Guarneri Momento speakers as well. It's a terrific integrated amp.
  Hope this is helpful. Enjoy your search and listening, Ken

Rubinken, Can you give us a long-term update/review of the DAC50? Was the brightness simply a burning in issue? I saw that you said it changed, but did it completely go away and are you completely happy?
I am interested in an Accuphase integrated amplifier. I am looking at the E-408, E-450, E-530, E-550, and E-360 as options. I am also very interested in both the DAC 50 card and the AD 50 phonostage card.
Besides wanting to hear from you about the DAC, could you also tell me a little bit about your amplifier? Which speakers are you driving? Did you compare to any other models by Accuphase before you decided on the E-550?

Thank you very much!

@rubinken thanks for creating this thread. Im looking up this comparison for my up gradation as well. Currently Im using DAC-30 onboard slot along with my E-460 Amp.
Im planning to upgrate to DAC-50 onboard slot. Can you please give me a qualitative feedback and improvements that you experienced in DAC-50 over DAC-30. Does the improvements makes a big difference in synergy and listening excitements in terms of Transparency, Soundstage, Low frequency Control and Tonality. Look forward your feedback. 

It has certainly warmed up and is quite intoxicating now.  Lovely.

Please let us know how it sounds after 4-500 hrs. Yes that lovely Accuphase sound. 

Thanks Chayro.  I too was surprised to hear such a bright sound form my Accuphase E-550.  I'm hoping that after hundreds of hours of burn-in I will again hear my enveloping, lovely Accuphase music.
  I will post here results after burn-in is complete.  Meantime, I patiently wait.

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.  

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

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.

Let it burn in for 400 - 500 hrs then see how it sounds. Relax, enjoy the burn in.