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I bought several Canton Ergo F speakers, used but in excellent condition and produced probably within the past 15 years. Prior to putting them into service, a quick test with my meter showed some very odd impedance numbers for them. Whereas my other Canton speakers show 3.6 or 3.8 ohms nominal, the Ergo boxes show .6Mohm, 1.6Mohm, and the other two show -3.6 and -3.something. I’ve never seen negative resistance on a speaker. Switching terminals on one speaker got me a positive value, but not on the other.

Since the Ergo F series were designed as HT surrounds, might they have some odd crossover network that might affect impedance values? I haven’t bought new speakers since the late 90s so I’m not up to date on this as much as I’d like to be.