For AirPod Pros, the headphone volume measurement included in iOS. I suspect it’s fairly accurate since it is a new Apple iPhone using new Apple AirPods Pro 2 listening to music mastered for and via Apple Music lossless.
For Fidelios, the Qudelix v2.0 update allows inputting impedance and ohms...
Equipment:
Apple AirPods Pro 2
Philips Fidelio X2HR
Qudelix 5K
Apple lightning-to-3.5mm dongle
Apple Music
iPhone 13 Pro Max
One feature I really like on Apple Music is Sound Check. This normalizes volume to -16 LUFS. With oratory1990 preset activated, I’ve set the Qudelix 5K to 85dbSPL with...