Hello RME members,
I got my first RME product yesterday - RME ADI-2 Pro FS (not BE - it was sold out). When I came home, I connected it to my MacBook on battery and my Audezes with metallic grills, and I loved it, but as I was playing with the EQ, I had to readjust my headphones, and I immediately got a loud buzzing sound from the headphones. Then I touched my MBR to pause the music, and this time the laptop’s surface buzzed me. I immediately disconnected everything and started to search for the source of it. It turned out that the front panel of the RME has some current going over it (sensible to the touch) when nothing else is connected to the RME, which immediately got me thinking that there is a problem with (1) the unit and with (2) the PSU and its grounding. I checked the power supply, which, lo and behold, is of figure 8 (there is no grounding wire with them). So I experimented further, and I connected it back to my MacBook, and this time connected the laptop to the outlet, and the RME found ground through the USB, to the laptop motherboard, its PSU and finally to the outlet ground. I’m contacting RME on Monday and the dealer about the issue, but while I’m waiting over the weekend, I was wondering what kind of PSU you are using? I believe if I had used a grounded PSU, I wouldn’t have noticed the issue, but at the same time, it feels safer to my layman’s thought process to have this safeguard.