There may be two reasons.
Subwoofer cable or rca.
However active or passive subwoofers that come with or without internal amplification may include rca connectors being compatible with rca cables.
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Rca cable for subwoofer.
The difference between subwoofer cable and rca cable is a particularly confusing topic.
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Philmore 6 ft rca right angle male shielded cable to bare wire for subwoofer and speakers gold plated.
Rca is an acronym for radio corporation of america the name of a company that has invented this cable type.
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60hz is the usual level of household electricity operating which often produces annoying hum in speaker systems.
When it comes to rca subwoofer cables in most cases this is an ordinary rca cable of a better quality that implies more suitable materials.
What an rca cable is.
A subwoofer cable connects speakers with an amplifier enabling low frequency signals.
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Whether the connection requires a pair of wires or an rca cable depends on the design features of the particular system.
A subwoofer cable connects an audio amplifier to a speaker designed to reproduce low frequency sound signals up to 100 hz.
This article provides a detailed description of both wires and should help you make a well informed choice.
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So some manufacturers label rca cables as subwoofer ones adding some beneficial features.