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Message: <blockquote data-quote="Jimi77" data-source="post: 8844529" data-attributes="member: 673702">Because that is what a capacitor does.  When wired in series a cap functions as a high pass filter.  Wired in parallel, caps are low pass filters.  Music isn't an DC power source, it's AC, therefore the capacitor is charging and discharging as the music plays.  When wired in series, at lower frequencies the cap will be able to charge/discharge fast enough to prevent a change in voltage and therefore block those frequencies.  Capacitors are common in power supplies to block noise; that is why you don't see/hear 60hz background noise in your home electronics.  Capacitors are also common in crossovers to block frequencies. [URL unfurl="true"]https://electronics.stackexchange.com/questions/116030/how-does-a-capacitor-blocks-low-frequency-signal-please-explain-it-without-the[/URL]</blockquote>

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