MannyAkimI did notice some hissing/somewhat slight pop sound when volume is at 9 o'clock and above. My LD1+ is sitting under my monitor and right next to me Gaming PC. I tired switching USB ports and was as bypassing my DAC and plugging straight to my motherboard Audio Out, no change.
I figured it was RFI but then I tried using my ASUS Ultra Book with my Dragonfly Black. LD1+ is still in same location, using the same cables. NO MORE hissing/slight pop even when volume is turned up all the way, this ruled out RFI from Monitor and/or PC. So WTF is causing it? I think it comes down to my Gigabyte Auros Gaming K5 AM4 board.
Has anyone tried AudioQuest Jitter Bug? I just purchased one from Amazon, hopefully this $50 gamble works.
Keep in mind, volume is never near 9 o'clock when I'm listening, it's just annoying.
MannyAkimUpdate, I tried the USB 3.0 port (Instead of the dedicated DAC port(s)) on my motherboard and BAM, hissing/pop is gone. Now I'm scratching my head.....
https://www.amazon.com/gp/product/B01BFJDTW0/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1