Four corn cob particleboard samples were used. They were displayed
on the floor of the emitting room as Fig. 2 shows and
according to the recommendations of the NP EN ISO 140-7 [26].
A minimum distance of 0.5 m between the samples and the border
of the floor, and a 45 angle between alignments of the samples
and the reinforced concrete structural elements (e.g. beams) were
guaranteed. The percussion machine was positioned on the floor of
the emitting room following the same position pattern. A stationary
sound field (with a continuous spectrum on the one-third octave
bands from 100 Hz to 3.15 kHz) was produced.