How Speaker Bass Tubes Work
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Speaker Bass Tubes Receive Signals
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To recreate sound, bass speaker tubes must receive the sound to recreate from a source, usually the radio head unit or media player. As the source generates sound, it converts the output into electrical signals that are sent over attached speaker wires; as these electrical signals pass into the bass tube's amplifier, a special apparatus known as a bandpass filter strips out the higher frequency sounds that cannot be accurately reproduced by the subwoofer.
An Amplifier Amplifies the Signal
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As the electrical signal from the source passes into the speaker bass tube, a built-in amplifier boosts the signal to create a stronger speaker response. Depending on the brand and model of the speaker bass tube, the amplifier may require external power or, in inexpensive models, may not be present at all.
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The Speaker Vibrates to Cause Sound
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As the electrical signals travel into the speaker, powerful but precise electromagnets respond to the signals with minute physical vibrations. As the electromagnets vibrate, the vibrations are transferred to the larger, attached speaker membrane. As the membrane vibrates, it causes vibrations in the air that are received by the human ear as sound. Since the electrical signals that cause the electromagnets to vibrate are boosted by a built-in amplifier in some bass tube models, the vibrations are reproduced more intensely, creating a louder sound response.
The Tube Amplifies the Vibrations
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When the speaker in a bass tube vibrates, its physical attachment to the bass tube housing causes that housing to also vibrate. The additional vibrations are received by the ear as additional sound, further boosting the speaker's sound output.
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