Artiphon

Orba's mini jack is a headphone out, which is, meh, but necessary. The problem is that the noise floor on it is very high. I have my volume at ~85% on the Orba, preamp gain at ~0%, and the software fader gain is at 0dB and the noise on the line is -30dB to -15dB. That's the swing, the average is probably around -18dB, Anyone else have this experience?

Did anyone come up with a solution eventually my new Chorda does the same thing. Definitely worse with a USB-C cable for me. 

Is there something that I could change, or is it a hardware issue on my unit and I should get a replacement from the seller?

I am experiencing the same issue. The background hiss is really loud wearing headphones (active and passive ones). It's not as bad when recording, as I can turn up the volume to improve the signal-to-noise ratio.

There is absolutely no noise on the speaker and the noise temporarily changes with the LEDs. Could this be an EMI/coupling issue?

for me it depends on which headphones I plugged in. some are brutally loud with others it is absolute calm

I hear a constant quite annoying and kinda loud white noise (hissing, like water flowing, rain) when the earplugs are in; USB-C port connected or not.

Same here the white noise coming out of the headphone jack is incredibly loud... is that supposed to be normal?

Massive difference to remove the USB connection. I will look around for a ferrite core to put on the cable. Has anyone tried one, or have you used a ground loop isolator on the headphone out?

Was it plugged into a USB port at the same time? That can introduce noise sometimes.

Hiss or hum?  If hum, can you figure out the frequency?  Don't have mine yet so I can't check.