Originally Posted by AllNight
Does your EQ on your iBasso player behave as I describe? (Only attenuates... turn it on (i.e., touch "Open"), everything gets quieter, even with all EQ sliders maxed.)
Ah.... I think I now understand. Yes, the iBasso player's EQ does attenuate when active. This had been discussed earlier in the thread. I stand to be corrected, but I think few DX100 users EQ their DXs, some for this very reason. But then most don't use anything other than the native player since only that uses the correct API for playback through the ES chip. Poweramp unfortunately uses software playback only. While I like Poweramp and had used it in the past, I won't reinstall it on my DX100 due to this limitation. Also, if you are adding preamp gain in Poweramp, that will explain the much higher perceived volume versus the standard player with EQ on.
The fewer apps you install on the DX, the better. Other than the standard apps, the only ones I have are streaming service apps, Tune-In, Rhapsody and Pandora, however these don't use the API either so I rarely use them on the DX and use them on my phone and iPad instead. I've found that the DX works best with few additional Apps installed. In fact I seem to recall Cowon players using Android had the Play Store excluded to prevent additional apps being installed and affecting player operation.
However,like others have said we are surprised you have to turn up your volume so much even with the EQ on. I don't have any of the headphones you mention but my highest impedance phones, a set of HD600 drive adequately on 220, high gain. For those readers who think this is high, I have about 30% hearing loss (due to age mostly). If you turn off EQ and retest with some 300ohm headphones and still have a problem, then I suggest you have a hearing test (I'm serious about this not trying to be a smart aleck). I wear an ITE hearing aid except for when I'm using headphones or IEMs and its revitalised my work days and conversations.