Installation, Operation and Maintenance Procedures when mounting the loudspeaker please ensure that it is re-assembled in the same manner in which it was received. To change the position of the loudspeakerplease adjust the bracket (by loosening / tightening the screws) as required. For optimum performance, always use the correct voltage / power and operate within the frequency limits as stated. Use only certified/specified cable glands and blanking plugs. Do not open loudspeaker when energized. The loudspeaker should be checked on a regular basis to avoid any build up of debris. Fasten lid with a torque of 2 - 3 Nm. Ex-loudspeakers must be earthed correctly using the specially marked screws.