How much Impedanz / OHM have the iMac 5K Audio-output

Hello Community,
my Question is in the Topic. - How much Impedanz / OHM have the iMac 5K Audio-output ? -
Its intresting for me, for buying some Headphones which have 32 Ohm or 70 Ohm or 250 Ohm.
I hope anyone of you can tell me that.
Kind Regands,
Sven

I would not expect the line/headphone output on the Retina 5K iMac to be any different then the other iMac models. That being said, the ouput is designed to drive headphones, so any headphone around 32 ohms should work fine. Going lower then 32 ohms should be avoided, though Apple's original ear buds were 23 ohms and they worked fine with all Macs.
Some examples,  Audio Technica m50's (a popular headphone) are 38. Some Sony headphones are between 63 and 92. All work fine with the iMac.

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