So it's a hardware issue?   Yikes. My Mojo was already RMA'd once, cause mine was from the buzzing first-batch.

  I'm having the same issue and I rarely use the USB output. Any workaround on this?

Guess i'm the only one that get's bothered by the effects of inverted polarity. Hidition Stock cable is made of copper. No idea if they have changed it, but Hidition had build 0.80 mm sockets instead of 0.78mm into my NT6. The only cable that didn't flushed out was the stock one, as it had...

Dunno. Guess it depends on the listener, preference and listening experience.   From what I tried with my NT-6 the soundstage and subbass (likely from phase shift) will slightly increase, but the stereo seperation and image is just plain wrong and unnatural as possible. Details which should...

Every Hidition IEM is made with inverted polarity. No exception.

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It's on goldenears.net. :D  

Glancing at the NT1's FR, they share heavy resemblance to the Knowles ED-29689, which are used in the ER4.

ck303 breaks your theory. :D

I've even put them into my ears at the same time with a splitter (left Ck100p, right im03), because they sounded too similar to me. :D The result was coherent.

found the thread: The successor of the ck100p is the im03. it doesn't has the peak in the treble due revised drivers. The sound sognature is exactly the same. however the size of the 03 is roughly twice the 100s. The im02 is not better in the treble section it just a smoother. What you prefer...

They had a silver plated cable, but that was back in 2011. But they had indeed changed the cable several times. The black tri-wire is the current/ newest one.

You'll have to bend e.g. the Whiplash Hybrid to the opposite way to have a right polarity. The colored mark points to the ear canal, not away.

So, just realized that Hidition IEM's have a corrected polarity like Ultimate Ears and Earsonic's on it's connector. So folks, be aware of it. :D

You can pair any headphone with the DX90 except HE6 and K1000.