Installation bracket series Ultra for audio systems as a universal holder for the installation and use of the speaker unit Art. EU1010, Art. 1010VC, Art. 2010, Art. 2010VC, Art. 8010 including handicap function according to DIN18040 for existing door stations and mailbox systems. The cut-out created on-site or by the mailbox manufacturer, as well as the bolts for securing the Art. EU1250A, must be made according to Comelit drawings. The installation bracket EU1250A is equipped with an audio speaker grille for the use of an audio unit. The lighting of the nameplates must be provided on-site, independent of the power supply of the intercom system.