The best cable for audio devices, regardless of the type of its coating, which is more commercial, is a cable that is sprayed and its material is pure copper.
The battery needs to be charged, or if it has just been charged, you need a new battery.
Yes. In all models, the crossover is equipped with a tweeter protector.
Regular and complete charging is the first recommendation, if you do not use the device for a long time, recharge it every three months to maintain the health of the battery.
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