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I’ve used various earphones from typical ear budds to Heil headsets and a home made Class D amplified 4” speaker ….. the speaker works wonderful and the Heil headsets work great but I wonder what the QCX_Mini headphone impedance is ? ?Hi or Low impedance /?

Previous posts suggested 32ohms
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73, Dan? NM3A

I have not yet tried it ... but last summer I picked up a 4" speaker at hamfest and later noticed that it is stamped '45 ohms' on the back of the magnet.? Checking Amazon I found that these are real (and not a smudged or misprint on my speaker).? I may actually have a use for mine? :-)

73, Harry KM3D

ps . . . Even a 32 ohm loudspeaker works so well on the QCX+5W headphone output I had to put put another resistor in series to keep the volume down . .?