@sam We are happy to help you with this. I am not sure why it would affect your Mac Mini. It shouldn’t, if wired correctly as there is no power going back to the mac mini, only a signal cable going to the amplifiers. This is the powered versions and not the passive versions, correct? COuld you do us a favor and take some pictures of the amplifier and the solder point to see if we can see anything out of place? Also some pictues of how you have it hooked up would be useful.