I have been using the UD-5900 with my 2011 Macbook Air, with an HDMI and DVI port connected, but when I try to use the audio jack in the front, even with no audio playing, there is a background crackling noise that I hear. If the music is loud, it is hard to hear, but it does not change with volume on the computer, so my guess is it is some interference internally. I have tried with multiple different headphones and have the same result. Furthermore, even when I mute the audio output from the computer, I have the same problem. Hopefully this it’s some setting, but my gut feeling is some hardware interference internally. Also, when I unplug the USB 3.0 cord connecting my computer, the sound remains for a few seconds, then disappears, which would be in line with what I expect with some interference problem. Some help would be greatly appreciated. thank you.
Other than this, I love the product. Wish it had 2 HDMI ports instead of an HDMI and DVI port, but it’s not a huge deal as I already had a DVI-HDMI adapter.