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it depends on volume. the most powerful device is amplifier and subwoofer. dvd monitor needs less. imho 3-4 hours for battery isn`t problem
 

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Finally, adding a capacitor as a power buffer might reduce ignition noise, and may improve the dynamic response of the audio system; it won't extend run time. Capacitors are "lossy" (self-discharge). Adding one will decrease your run time.
you needn`t it. it`s choice for sound pressure competitions, when you need huge amount of energy for big "BOOM"
 
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