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But virtually all car speakers are 4Ohm, right? So that's a non-issue unless you get a non-standard speaker or the speaker becomes damaged some other way first.



Funny, I thought they were all 8 ohms, but Boston Acoustics web page lists some as 3 ohms. I'm sure the 8 used to be the standard years ago.

Also, some folks will parallel (or even series) speakers together, which changes impedance.