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Will a 4 ohm amp damage a 2 ohm speaker?

Updated: 10/26/2022
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14y ago

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No, but it may be the other way around. Since you're using a 2 ohm speaker, don't expect the volume to be louder since the speaker uses twice as much power than a 4 ohm speaker does. If anything, I'd be cautious about the amp having the ability to handle the extra load. It's a myth. There is really no 4 Ohm amplifier on the market. And there never was. The amplifier will have an output impedance of around 0.04 ohms. In hi-fi we have always impedance bridging. Zout << Zin. That means the output impedance of the amplifier is much less than the input impedance of the loud speaker. The damping factor Df = Zin / Zout tells you what Zout is. Zout = Zin/Df. If the damping factor Df = 200 and the loudspeaker impedance is Zin = 4 ohms, the output impedance of the amplifier is Zout = 4 / 200 = 0.02 ohms. You see, there is no "4 ohm amplifier" on the market with a 4 ohm output impedance. Scroll down to related links and look at "Voltage Bridging or impedance bridging - Zout < Zin".

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Q: Will a 4 ohm amp damage a 2 ohm speaker?
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