Yes, I think this is quite clear with this statement from Apple:I own MB Air M2 and I can say DAC is fine, but the amp has limits. Driving 16 ohm Sash Tres results in very detailed sound, certainly loud enough, but thin (anemic). Plug it to real amp and hear the difference!
This is not a complain, just observation.
"When you connect headphones with an impedance of less than 150 ohms, the headphone jack provides up to 1.25 volts RMS. For headphones with an impedance of 150 to 1k ohms, the headphone jack delivers 3 volts RMS. This may remove the need for an external headphone amplifier."
A 16 ohm HP gets not enough "juice", nothing to complain about.
Matt