I do not known where to post this question so post here. What I found is a headphones will make a sound like white noise with out any dap, phone or similar thing. This picture below, a headphone 60 Omh of impedance (I do know this is not matter because 300 Omh cans also experienced) and normal...

It does not appears on iBasso website. But it looks like 2nd generation headphone of iBasso. SR2?

Hi Sennheiser lovers! Do you think hd800/s is too "open" that makes unnatural sound field? Correct me if I am wrong describle sound and lacking of EN language. This is my feeling : 1. Good layering of instruments 2. Rich sound and detail texture 3. Flat and detail bass 4. Full range balance...