AMP 100 & DSP making a terrible high pitch noise after a fresh install

I just made a fresh install of Hifiberry OS on my Raspberry pi 4, I installed first on the Raspberry pi, then turned it off, then plugged the Amp 100 with DSP, then restarted. After restart I played Spotify on my mac and channeled the sound to the Amp 100 via Airplay, and the speakers made a really horrible noise, high pitch.

It happened already yesterday as I was doing some tests with DSP and optical in. 

My DSP program is V.11, the default one that came in with the fresh install.

Now I'm a bit concerned to start the hifiberry again, because I really don't want to break my speakers with this sound. What do you recommend me to do?


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