ER2801 multimedia active speaker when adjusting volume volume not adjustable or noisy repair volume cannot be adjusted for volume adjustment potentiometer circuit wire. Volume adjustment potentiometer "hot" side open the silent, the "cold" side open so loud and cannot be adjusted. When you adjust the volume with the noise for double-potentiometer within poor, power down the speaker, repeated large angle and rotate the potentiometer, activities can often be potentiometer contacts get rid of dirt, has improved, if there is still noise, had to put another one potentiometer.wAmservice manual download site