I was able to drive the 560s off my 2020 iMac with no issues. I did use the on board 3.5mm jack as well as a Elgato Wave 3. The Wave 3 pumped out at least 20% more loudness at the same listening level. I just purchase and set up a Fiio K5 Pro ESS. There is a subtle but a very distinct difference in the listening experience at the same loudness level as the Wave 3 or iMac. I wouldn’t have purchased the FIIO K5 solely for loudness. I also have significantly more power to drive the headphones at louder levels as needed and the K5 can deliver high quality lossless. I am really enjoying the difference between stranded audio files and high quality lossless. There’s something really great about hearing the difference between drum stick strikes on the high hat.