I just joined the raspberry pi community some days ago and I bought the amp2 bundle with an raspberry pi 4 (2GB) with a plastic case as suggested in the shop (https://www.hifiberry.com/shop/bundles/hifiberry-amp2-bundle-4/). Everything works fine but I am surprised how warm this setup gets even when idle (I use volumio on it). At room temperature the CPU shows 83 °C. I expected the raspberry to have a small energy footprint and I wonder if it would be better to use a raspberry 3 or even smaller instead of version 4. Or is temperature rather related to amp2?