Last thread on this was 2 years old so figured this could get it's own new thread. Simple question: My LSR305's have no hiss when plugged into my phone (or not plugged into an audio source), but have a very noticeable hiss when plugged into a USB DAC (run either directly or via powered hub) or the headphone/line-out out on my monitor. What does that indicate? I am guessing this is a power issue given they work off my phone and are silent? If this were a USB issue, I would assume there would be no hiss on the line-out of my monitor. I was looking into the various powered USB de-crappifiers but I am unsure if that will do anything, also since a powered USB hub does nothing either, and I have zero problems with other USB DACs. Isolating the speakers on their own outlet is not an option here. What's my issue here? Thanks!