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JBL has been around for 80 years, making it one of the longest-standing audio equipment brands today. What started as an American-founded company providing sound systems to movie productions and music festivals is now an audio brand owned by Samsung , which only increased its global reach. However, despite the rich history, it's only natural to wonder how long its speakers actually last. But since that question can apply to loudspeakers like the JBL Partybox or smaller, wireless Bluetooth speakers like the Clip, Go, and Flip series, it doesn't have a uniform answer.…