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Hello, the purple light is indicating a mode change. I attached a link explaining the LED bar. https://www.polkaudio.com/-/media/files/documentmaster/polk-us/polk-signas2_quick_start_guide.pdf
Sorry, there was a problem. Please try again later.I believe the light is supposed to flash and then go off, based on my reading of the instructions. I also think that it only works when the audio setting is set to the movie option.
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