The acoustic emitter (passive acoustic column) SEL SP 157-AS is used to reproduce acoustic noise signals.
It has a control for the level of the emitted signal (under the screwdriver), located on the rear panel.
Technical specifications: Band of reproduced sound frequencies from 90 Hz to 11200 Hz Resistance 12 Ohm Emitted power max. 5 W Built-in radiation level control Overall dimensions 90x65x25 mm Weight 250 g