Headphone output on the Mcintosh C2200

Various brands and models of headphones have different impedance's. On my McIntosh MA6600 it accepts headphones rated 16 to 250 ohms impedance. Normal would depend on the rating of your particular headset. Your headphones may need an even higher impedance thus requiring the proper outboard headphone amp. Or headphones even of the same basic model but with a more suitable impedance match.
I find my MA6600 coupled with the the headsets rated within the units range sound and work beautifully. Love having the headphone input on the McIntosh.
Congrats on your C2200 it is a dream.

Your Mac most probably doesn't use the same circuit for the headphones as it does for the speakers. It probably (like most components of this type) use a lower quality op amp to drive headphones. I, therefore, recommend the use of a seperate headphone amp.....much higher quality with no problems.

Thanks for the input. Recommendations for headphones and a headphone amp are most welcome