i use over the ear koss portapros with my sony (uk capped version btw) and its definitely loud enough. i usually have it at about 70-80 of 120 on volume, indoors.In terms of DAP, I also believe the Sony is an excellent choice. But when I look at the power, I see quite big differences. My current X1 has an output level of 65 mW @ 32 ohms. According to the specs, the Sony has 1.1mW @ 32 ohms. With the Japanese variant this would be slightly higher. I read somewhere that this would be 35mW @ 16 ohms. But I cannot officially confirm this.
But this is still a lot less than the X1. It has 100mW @ 16 ohms. But I have no idea whether these specs can be compared one to one.
In any case, the output of my iPod classic 6th gen was insufficient for my dt770's. For my taste.
when im outside i either use moondrop iem or sony Bluetooth over the ear headphones, with noise cancelling. i dont think the cap effects bluetooth fyi. same volume on both capped and uncapped.
ive never run into a problem where its not loud enough but i think you have to be smart about the headphones you choose to use with it.
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