Within a week of purchasing them I had several issues with these headphones, the JBL Live 660NC. The biggest issue I've had is an unusual crackling sound, which appears to be related to the noise-cancellation itself. This crackling noise is quite intrusive and cannot be easily ignored. The noise cancellation on these headphones isn't great either, in fact I'd say it's decent at best. The battery life is the standout feature of these headphones at 40 hours. In general, these headphones did not impress me. While they're pretty decent across the board, there are better $200 options out there.
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