This is a common characteristic of the equiripple filter algorithm Cirrus Logic uses, and you can see it in their datasheet plot. The only way to get rid of it is to change the filter by resampling, as HQPlayer does.
Change the y-axis units to dBFS. The plot will then properly reflect the levels from your ADC, and 0dBFS will depend on what sensitivity you've set.
to tell you the truth as a musician of over 40 years , Cirrus sounds more like natural and real timbre more than ESS and AKM.
chips DO share a sound. Of course it’s all of the rest of the DAC. But chips have a similar sound. My RME and Bryston both have AKM and share a very similar DNA for timbre. The Bryston is bigger sounding and deeper. But they do sound more similar.
I tried the Topping D30pro and it has a cirrus chip in it. 4 to be exact and it shared common DNA with my Marantz.
i don’t know why more DAC makers don’t use Cirrus. I think they sound great.
and yeah I do use HQplayer many times with the Marantz. But it’s own filter sounds great as well.
just a wonderful sounding DAC. which few know about. Killer headphone amp as well
thank you so much again for your help