Yes, all models include the ability to change folders.
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.
Yes, use the terminal on the back of the band designed for this purpose.
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 battery needs to be charged, or if it has just been charged, you need a new battery.
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