I'm testing the DAC Pro with Pianoteq 8. I found that if I use the 3.5mm audio port I get cracks in the audio, especially with higher notes, but from the RCA ports the output is perfect. May someone understand why? This does not happens for example with the Suptronic X400.

maybe because the headphone output isn't line level ?

I'm testing the DAC Pro with Pianoteq 8. I found that if I use the 3.5mm audio port I get cracks in the audio, especially with higher notes, but from the RCA ports the output is perfect. May someone understand why? This does not happens for example with the Suptronic X400.

I have the IQaudio version of the DAC Pro (before it was rebranded as an official Raspberry Pi accessory) and have no issues when plugging headphones directly into the 3.5mm audio port. Maybe check your alsamixer settings?