My speaker is producing static sound after i plug in my mic cable . When i unplug it the static sound is gone . Is it normal that the speaker have sound of sand when i turn the volume to the max ?
It is generally normal to have a slight hissing/static sound at high volume with a microphone amplifier. As americanaudiophile suggested, try lowering the Mic gain, or the Mic volume, first, then turning up the Main volume on the amplifier.
The noise you describe is not being generated in the speakers. It is the mic preamp hiss at full gain. Turn the mic gain down and the output volume higher to achieve the same level but without the noise.
It is generally normal to have a slight hissing/static sound at high volume with a microphone amplifier. As americanaudiophile suggested, try lowering the Mic gain, or the Mic volume, first, then turning up the Main volume on the amplifier.