Sound Power Reference Source
Qref - QSources BVBA (QSources)
Precision omni-directionallity in all directions, horizontal and vertical
plane. This source has a frequency range of application between 100 and
8000 Hz (third octave bands) Despite only weighing 1.4 kg and having a diameter of 105 mm, it produces a maximum sound power level of Lw 104 dB.