Quote:
Originally Posted by LimitedSlip
Since an ohmmeter is uses a battery as a voltage source this will give you the DC resistance of the circuit under test which is to say the resistance at 0 Hertz. What would be of more interest is a graph of circuit impedance (the vector sum of capacitive and inductive reactance along with resistance) from 20 Hertz to 20 Kilohertz. Not as easy to come by but much more indicative of amplifier load across the audio spectrum.
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Speaker impedance will vary quite a bit with frequency. As I recall from my past life working with professional sound reinforcement equipment, a typical 8 ohm rated speaker would register in the neighborhood of 6.2 ohms of DC resistance. I'm guessing a 2 ohm speaker array would be around 1.55 ohms and a 1 ohm speaker array would measure around 0.77 ohms on a meter. I'm surprised there are 2 ohm car audio components, but I've been disconnected from audio for a few decades. Back in my day, 2 ohms was dangerously close to a dead short and was to be avoided at all costs.