No lasting 3

Black has just soul: one of the sides is definitely dumb. Thinking of a bad contact, I have removed the helmet. The interior is rather well designed, by it against me have been impossible to locate the fault, as some parts are glued. The cable is extremely thin. This is an advantage because it is discreet. By cons, this nest clearly not sustainable.

As for white, bought more recently it also shows signs of weakness. Intermittently, the sound cuts one side. Triturate the plug and wire seems to have no impact on the problem that eventually disappears for no obvious causal relationship.