The other wire is negative and can go to the negative terminal of the battery or otherwise grounded to anything metal on the car.
Red and white wire positive or negative.
Words alone are not a marking.
The term positive.
When you re hanging a chandelier or any other ceiling light first find the 3 wires coming out of the hole in the ceiling where the light will go.
White is neutral in home wiring.
Identify the black positive wire on a ceiling light fixture.
Recognize that the black wire is the positive one the white wire is the negative one and the green wire is the ground.
Typically the positive wire is red and the ground or negative is black.
Red is sometimes used in 3 way switches and dimmer applications so it is likely red is hot in your application if it pertains to home wiring.
Lastly there are three wire systems that feature a center tap wire which is colored white.
Although red usually denotes a positive circuit there is nothing about the wire itself that makes it positive or negative.
The red wire is usually positive in electrical circuits.
However most speaker wires don t do colors.
For a two wire system with a negative ground the positive wire is red and the negative wire is white.
Good news is with speakers it doesn t really matter which one you choose as your positive and which as your negative just so long as you are consistent.