Dsp into naim DacV1

Hi does anyone have any experience of using DSP features into a naim dacV1?

I tried to keep it simple by selecting max supported bit depth but I get crackling and distortion, infact any of the presets causes distortion so I just have to give up.

Using the USB input on the V1.

Whenever I’ve had this problem it’s because my DSP has exceeded the headroom. For example, if I’m using an EQ, and it has a boost of 5db somewhere, then I need to adjust the headroom down by 5db so that signals at max (all to common in this day and age of the loudness war) don’t clip.