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Speakers need to be matched to the amplifier. This will allow maximum dynamic range of power before distortion. In extreme cases, overloading an amplifier can damage it.

A 4 ohm speaker requires a certain voltage and current to achieve a certain power. A 2 ohm speaker will require less voltage or greater current (ratio the square root of 2) to achieve the same power. The decision is based on the system design, including the design of the cross-over network, if there is one.

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