Got mine yesterday and out of curiosity after reading another review I put a kill-a-watt on it and tested it out.
Yes there is a "chirp" sound when it turns itself on from sleep mode. It doesn't border me however since it is not that loud and it only does once. In sleep mode, it draws about 20w. Awaked but not playing any big sound, it draws about 25w. Basically the sleep mode is really pointless.
I have other JBL Studio L series speakers and I can tell the big difference over those home theater speakers. But this sub I really don't hear or feel any difference. A boom is just a boom.Get more detail about JBL L8400P 12-Inch Powered Subwoofer with 600 watt Digital Amplifier (Black).
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