Some terminals are also color coded.
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Although some speaker cables are sold with color coded insulation to distinguish positive and negative the wires themselves are identical.
In some high end speaker wires the insulation is transparent or see through enough to see the bare wires.
Know that the copper wire is usually positive on a speaker wire.
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When this is the case usually the silver wire will be the positive polarity and the copper wire will be negative.
It is common for the car speakers to have different sizes of terminals and an easy way for you to find out which one is positive and negative in your car speakers.
Every speaker wire will have an indicator to tell them apart such as color.
Most often the negative terminal is lower than the positive one which means the larger one is positive.
This can help you make out easily which speaker wire is positive or which one is negative.
The most common color coding used in wires are copper and silver.
On a standard wire used for things like speakers and amps the silver strand is the negative wire and the copper colored strand is the positive wire.
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Look at the insulation.
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The one is smaller than the other.
Look closely at the size of the terminals.
Positive speaker wires have a positive symbol or a negative symbol to indicate the corresponding connector on the wires.
A common color code that is used is black for negative and red for positive.
Usually silver wires are with a positive polarity while copper wires have negative polarity.
Many speaker wires will also come with unique indicators to tell them apart.