The WAL 165/6-A/B PP is equipped with two independent transformer/loudspeaker-combinations and allows loudspeaker’s supply by two different wires. By the traditional alternating division of the loudspeakers in the A- and B- line, the breakdown of one line causes an unsupplied area between the next active loudspeaker of the redundancy. Using the loudspeakers of the A/B series the A- as well as the B- line is existing in every mounting position. Accordingly the level loss in the considering area is lighter. If one line fails there will be a higher comprehensibility of speech and security compared to an alternating configuration. Characteristic for the attractive WAL series is the premium MDF-wood housing whose robustness is featured by the IP 54 degree of protection.