Dynaudio Contour 3.3 loudspeaker Measurements part 3
Fig.8 Dynaudio Contour 3.3, step response on tweeter axis at 50" (5ms time window, 30kHz bandwidth).
Fig.9 Dynaudio Contour 3.3, cumulative spectral-decay plot at 50" (0.15ms risetime).
Finally, despite its size, the Dynaudio's enclosure is free from resonant problems, implying an optimally braced, well-damped construction. What modes were present were both high in frequency and low in level, the ideal condition. Fig.10, for example, shows a waterfall plot calculated from the output of a simple PVDF-tape accelerometer fastened to the front baffle below the woofers. The only significant mode present is at 648Hz, well above the region where it could lead to coloration. And even the big side panels had just one more mode present, at 300Hz, though this was equally low in level.—John Atkinson
Fig.10 Dynaudio Contour 3.3, cumulative spectral-decay plot of accelerometer output fastened to cabinet baffle below woofers. (MLS driving voltage to speaker, 7.55V; measurement bandwidth, 2kHz.)