The amplified directional Loudspeaker NGS-1A is an excellent tool, robust, autonomous and easily transportable capable of producing high sound pressure.
For this reason and for its outstanding qualities of directivity and power is particularly suitable for noise insulation measures, reverberation time etc ...
The dual power supply - battery (optional) makes the NGS-1A extremely versatile even in cases where there is no access to the electricity network or where the power cord can create connection problems or obstruction.
To make it even more independent there is a pink and white noise generator inside which, however, does not preclude the possibility of receiving external sources through the dedicated inputs (BNC and jack).