twins dual 4mm speaker wire terminal audio binding post connector
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Changzhou AIOpower New Energy T&S Co., Ltd.
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A binding post is a connector commonly used on electronic test equipment to terminate (attach) a single wire or test lead. They are also found on loudspeakers and audio amplifiers as well as other electrical equipment.
A binding post contains a central threaded metal rod and a cap that screws down on that rod. The cap is commonly insulated with plastic and color-coded: red commonly means an active or positive terminal; black indicates an inactive (reference or return) or negative terminal; and green indicates an earth (ground) terminal.
Commonly designed in a style called five-way or universal, such binding posts allow the connection of several different types of connections:
The binding post was a commercial invention of the General Radio Corporation.