Many speaker wires will also come with unique indicators to tell them apart.
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Some terminals are also color coded.
Positive speaker wires have a positive symbol or a negative symbol to indicate the corresponding connector on the wires.
When this is the case usually the silver wire will be the positive polarity and the copper wire will be negative.
The one is smaller than the other.
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Although some speaker cables are sold with color coded insulation to distinguish positive and negative the wires themselves are identical.
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Look closely at the size of the terminals.
Speaker cable terminates at the end in leads two separate wires to be connected to positive and negative terminals on the back of a speaker and its corresponding connection to a receiver or amplifier.
These wires are often held together by a clear casing so they re easy to determine the polarity of each side quickly.
In some high end speaker wires the insulation is transparent or see through enough to see the bare wires.
Look at the wire itself.
This can help you make out easily which speaker wire is positive or which one is negative.
A common color code that is used is black for negative and red for positive.
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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.
Look at the insulation.
The most common color coding used in wires are copper and silver.
Usually silver wires are with a positive polarity while copper wires have negative polarity.
Every speaker wire will have an indicator to tell them apart such as color.
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Most often the negative terminal is lower than the positive one which means the larger one is positive.