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My C3,5BT speakers make a rhythmic thump for about 10 minutes

Posted: Fri Jul 26, 2019 8:46 pm
by jimrumbaugh
When first turned on, my C3,5BT speakers make a rhythmic thump (about 2 thumps per second) for about 10 minutes .

Is this normal behavior ?? . Any advice on how to avoid this ??

Jim Rumbaugh