IMac 8.1 Audio Impedance?

What is the impedance of the audio output for an iMac 8.1 (early 2008, 24-inch, 3.06 GHz Intel Core 2 Duo)? My new headphones have an impedance of 24 ohms and produce constant static at any volume level.
Documentation shows newer iMacs have an impedance of 24 ohms and I've tested the headphones on a newer iMac with no problems. However, I can find no iMac 8.1 documentation that lists its impedance.

I thought that too, but other headphones (Sony MDR-G57G, Altec-Lansing AHS302USB) work fine on my iMac8,1. However, earbuds (e.g. Samsung EHS44ASSBE) produce the same static as the Sony MDR7506s
Note: the static is also often accompanied by a high-pitched, frequency dependant noise in either the left or right speaker (for both the earbuds and the Sony MDR7506).

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