The battery needs to be charged, or if it has just been charged, you need a new battery.
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.
Yes, all Dynapro active and portable bands have Bluetooth.
The answer to this question is generally given by the amplifier manufacturers, in general the total resistance of the bands should not be less than 2 ohms. This is equal to 4 bands of 8 ohms or 2 bands of 4 ohms for each input.
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