Low Profile Security Masking SpeakerAVLELEC ASM20 00 masking speaker assembly is designed to accurately reproduce the required spectrum of masking signal into small plenum spaces. The innovative square enclosure ensures accurate sound masking frequency response. Specially designed 2"x4" cone loudspeakers (2) are included in the package. A high efficiency 70. 7V internal transformer is coupled to an external tap selector switch for easy system tuning. To meet most any local code