• If you want to use a system with a backup amplifier, the 'Digital audio matrix (4/4/16)' PC2003 is the best solution, as all the wiring is contained within the digital audio matrix.
  • If you want to use a 'Digital audio matrix (4/4/4)' PC2001 or 'Digital audio matrix (0/4/4)' PC2002 in a backup scenario, an external signal matrix must be used to switch the 100 V speaker lines. The matrix is controlled by a logic control output of the connected digital audio matrices.
External relay matrix