I opened the playback devices window and played the same audio file over and over and watched the audio level. With headphones unplugged the meter shows a nice, high level. When I plug headphones in the quality is good for a split second, but as soon as it realizes the headphones are plugged in the audio level immediately drops and becomes ... Campfire audio cascade closed backed dynamic headphone. Nordost at high end 2019. The Vali's 6.5ohm output impedance may be technically problematic for headphones under 52ohm (if you follow the 1/8 rule), in that it may affect their tonal balance and sheer...