Comment 39 for bug 1654448

Well, the problem might be more noticeable with low-impedance earphones/headphones. So more likely earphones, but possibly also headphones. (<--- This is now guessing)

Yes I would agree (and mentioned in comment #37) that the workaround makes audio quieter. That might be the best solution possible, but hopefully not.

One problem is that headphone sockets are notoriously noisy in many computers. And it's often not a problem that can be fixed in software. My general recommended solution on any PC is a hardware one: Always use a USB DAC (digital-to-analog converter), AKA a "USB sound card". That separates the analog audio signal generation from the physical machine and avoids such noise/hiss problems.