Your phone charger probably has a PWM circuit or likewise that alternately draws current and doesn't. This creates spikes on the feed.
Your capacitor cannot filter out high frequency signals like said spikes.
Maybe you can put a RFC choke on the feed to the speakers, ahead of the capacitor. You'd filter out spikes from any source.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
Last edited by RedDevil; 11-03-2016 at 07:55 AM..
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