Problem: I connected a Peecker Sound active speaker and it doesn't work.

First, make sure the speaker is switched on. If it does not switch on, check to make sure there is voltage in the mains outlet, then make sure that the mains cable is not broken or damaged and that the fuse is working properly. If the fuse is blown, replace it as follows: using a Phillips screwdriver, apply pressure on the fuse-holder, turning it anti-clockwise and slide it out; then, after removing the blown fuse, replace it with an identical one, inserting it in the fuse-holder and securing it in its seat with the inverse sequence. If the amplifier is on and does not work, check that the signal is arriving from the source (mixer), then check that the signal cable is working properly (the XLR connector could be damaged or there may be a disconnected wire).