So you are using the Jr. Cause its such a great dap?
I'm sure you can read my justification as I posted above to Raketen. But I feel the need to respond to you as well, as you are a person I have a lot of respect for.
As you know through experience, everyone has different earphones, that range from 4ohms to 300 ohms (yes, there's higher and lower, job st saying in general.) Furthermore, each earphone is either dark, warm, neutral, bright, or even hot as their sound signature. Those two contributing factors are already a big enough reason/detractor or proponent to like or dislike a specific DAP.
For me, and my equipment, I absolutely love the AK Jr. But I can't stay monogamous to one DAP, which is not the Players fault, it's my own curiosity's fault. Right now in terms of overal sound the Shanling M2 has my heart, but I consider the AK Jr to be right there with it, then coming in 3rd place is the DX80, and then the Plenue D holding the 4th place position. It's not that it's bad, it's just there are others that offer sound more suited to my personal tastes and preferences with my earphones.
I'm sorry the AK Jr wasn't right for you 3 separate times, as I vaguely recall, you had the same experience with the DX80, you owned it 3 separate times as well. Hoping the firmware bugs would be resolved.. Sadly haven't been amended, as of writing this (March 28'th) But unlike Astell & Kern, at least iBasso is actively trying to fix those issues. Honestly, they've made headway, but still aren't there yet.
I just pulled the trigger on the Shanling M5, because of the specs alone, AK4490, Muses8920, and the AD8610 leading to the Buf634.. By the way, Dualed out.. So that should be an interesting listen. I may get it, and find that it's not worth twice as much relative to the M2 for my equipment and personal tastes, but that doesn't mean it's a bad player, for someone else and their equipment.
I just hope you understand my reasoning for making the statements I've made. I am not trying to start any arguments. Just felt like there was a lot of bashing of equipment going on, where I felt it was a little unnecessary to do so. So I chimed in with my two pence.