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Standard speaker impedance 

 

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 Post subject: Standard speaker impedance
Posted: Mon Oct 16, 2006 1:16 pm 
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If a standard car stereo has 8 ohm speakers attached, should it be okay to install 4 ohm speakers, or should I get an external amp just in case. I would rather avoid installing an amp, but if required I will.

Thanks for any help
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Posted: Mon Oct 16, 2006 2:37 pm 
Tyre Shredder
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By using 4 ohm speakers in place of 8 ohm speakers, whatever is driving them will have to supply twice the current... If whatever is driving them is not 4 ohm stable, it will likely shutdown or cook itself.

You can put a high wattage 4 ohm resistor in series with your 4 ohm speakers, if you REALLY don't want an external amp, but the resistor will be absorbing half your power.
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