The portable PA3 Power Amplifier contains a DSP-based signal generator with equalizer. In conjunction with the DS3 Dodecahedron Speaker, a pink noise is produced with an acoustically flat frequency response. The equalization ensures that the ISO 16283-1 requirement of ? 8 dB difference between contiguous 1/3rd octave bands in the emitted sound is met. A test signal optimized for maximum sound power is available as well as an external audio input socket.

All operating components are positioned on the sloping sides of the amplifier and illuminated - thus easily recognizable and accessible from a standing position. For low-frequency measurements, an active subwoofer can also be connected. The test signal can be switched on and off from outside the measuring room with the push of a button on the supplied radio remote control.