by iamammon on October 25th, 2004

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If I plug in more than one speaker to my system and turn the volume past 3, the receiver shuts off. If I have only one speaker plugged in, it works fine. What could be wrong?

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by RedJohn on September 19th, 2005
I would guess that you are running the speakers in parallel, which halves their rated impedance (if they are identical). This problem is aggravated by the fact that the rated impedance of a speaker is a nominal value. Impedance varies with the frequency of the input signal and, for an 8 ohm (nominal) speaker, may fall to as little as 3 or 4 ohms at some frequencies and rise to over 50 ohms at others.

Higher impedances are not a problem, but if two speakers are wired in parallel, their joint impendance halves (assuming they are the same design). Hence, a pair of nominal 8 ohm speakers wired in parallel would have a nominal impedance of 4 ohms. If the impedance of an individual speaker falls to, say, 4 ohms at a particular frequency, the impedance of the pair would fall to 2 ohms.

Many mid-fi amplifiers cannot drive an impedance of less than 4 ohms and the amplifier output could shut down if it is equipped with a protective output circuit.
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If I plug in more than one speaker to my system and turn the volume past 3, the receiver shuts off. If I have only one speaker plugged in, it works fine. What could be wrong?

Answers. 1 helpful answer below.

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If I plug in more than one speaker to my system and turn the volume past 3, the receiver shuts off. If I have only one speaker plugged in, it works fine. What could be wrong?

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