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If you are referring to a capacitor that connects to a 'tweeter' (the smaller high frequency speaker) it's function is to filter out the lower (bass) frequency signals, a capacitor 'blocks' direct currents (DC) and as a result the electrical 'signal' to a loudspeaker gets 'closer' to a direct current, the lower the frequency, so the capacitor is 'happy' to let high frequency (treble) signals pass through it, but resists the signal as the sound frequency decreases, down to the lower (bass) signals.

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