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There are two possible reasons why you'd put a capacitor between a speaker and it's source. One is to block DC from flowing through the speaker, which could cause problems to the source (DCC chip in this case) or the speaker. Speakers do NOT like DC flowing through them. The second reason is to block lower frequencies from passing through the speaker. This is done on speaker system crossover networks to prevent tweeters from being hit by all the energy from the bass. Putting a capacitor in series with a speaker will not likely reduce the buzzing or hum from the DCC system. Hope this helps, Mark in Utah
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