Card with 2 audio outputs with supervision to be inserted in digital audio matrix (1 slot). Audio outputs with 0 dB sensitivity and priority control output (RJ45 connectors). Measure of the status of speakers line and amplifier. Balanced outputs by transformer. Independent audio level adjustment for each output. Volume controls, bass and treble, controlled through the Compact keyboard and/or PC. Output contact to indicate failure in amplifier or loudspeakers line.