Very good player for use with a good quality headphones (focal classic example) to enjoy the entire spectrum. Registrations to do (if possible) en flac for better listening. I appreciate and discover the "subtleties" of my favorite tracks .The scene is impressive width, the details are there, each instrument is perfectly rendered. The "amp" is more than enough (of 60 I listen to 25) but for a helmet that will require more, there will be something. Without adjusting the equalizer (position 0) the sound is perfect (matter of taste, and recording), but testing the changes are real, so everyone to see (or rather hear). overall very good material, I recommend without hesitation. Small problem: documents provided with the X3 Fioo very limited (fortunately there is the Internet!) Material as ordered and very fast delivery, well protected, thank you Amazon.