Vibra-Sonic Control SoundMaskIt DSP8807 digital sound masking/paging system is a self contained, digital signal processor with integral amplification designed to efficiently route and mix masking, paging, and background music sources. Applications include speech privacy and general paging for office spaces, health care campuses and secure government facilities. Specs: https://docplayer.net/59516850-Sound-masking-systems.html https://manualzz.com/doc/25671888/data-%E2%80%93-soundmaskit-dsp8807---vibra 200$ obo