“I hooked up my SB400 a couple of different ways, ARC HDMI 1st then the optical, but either way it produces a very load POP when turned on. Turn the sub-woofer off and mute the sound bar, turn it off then back on and it still produces a very loud POP. ??”
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Please change the settings in your source unit to PCM digital audio output. This should eliminate the popping noise. If this doesn't hep, please submit a case at www.jbl.com/support-contact.html and the Customer Service team will be more than happy to further assist you.
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