So in this office, there are a bunch of iMacs which all suffer the same problem. When using the 3.5mm audio jack with any headphones, there's some pretty loud radio interference - that is, there's a foreign radio channel that is very clearly audible and it's loud enough to make listening to music unpleasant. This doesn't happen when listening through a laptop or phone. It's only things plugged into the wall directly anywhere in the office, including a receiver. This actually happens at another office a few blocks away too, but the signal is much quieter. I've been led to believe this is a problem that a ground loop isolator could solve, but I'm not 100% sure how it would help. Would a device like this plugged in between the iMac and my headphones likely solve the problem?