The battery needs to be charged, or if it has just been charged, you need a new battery.
Yes, all Dynapro active and portable bands have Bluetooth.
No. More than 90% of commercial speakers have a paper screen that cannot be waterproof, but all passive Dynapro bands are resistant to water and moisture, but not waterproof.
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.
The most standard and most resistant audio plug at present are Speakon plugs (Speakon, all Dynapro bands have a Speakon female, and of course, a Speakon male plug should be used for connection.
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