In the time domain, the Avanti's step response (fig.5) indicates that the three upper-frequency units are connected with the same positive acoustic polarity, even though, despite its sloped-back baffle, the speaker is not time-coherent. The woofers are connected with inverted acoustic polarity, which leads to a smooth hand-over of the step wave from the midrange units in fig.5, which in turn implies good frequency-domain integration between the units. 
Fig.5 Audio Physic Avanti III, step response on tweeter axis at 50" (5ms time window, 30kHz bandwidth). Finally, the Audio Physic's cumulative spectral-decay plot (fig.6) is simply superb! Other than some well-suppressed delayed energy at 5.3kHz, which I suspect is due to a metal-cone mode, the graph is beautifully clean, which correlates with the speaker's clear presentation and absence of treble grain.
Fig.6 Audio Physic Avanti III, cumulative spectral-decay plot at 50" (0.15ms risetime). The three earlier Audio Physic speakers from Joachim Gerhard that I tried—the Tempo, Step, and Virgo—all impressed me with their solid engineering and excellent sound quality. The Avanti III exceeds my expectations.—John Atkinson
Fig.5 Audio Physic Avanti III, step response on tweeter axis at 50" (5ms time window, 30kHz bandwidth). Finally, the Audio Physic's cumulative spectral-decay plot (fig.6) is simply superb! Other than some well-suppressed delayed energy at 5.3kHz, which I suspect is due to a metal-cone mode, the graph is beautifully clean, which correlates with the speaker's clear presentation and absence of treble grain. Fig.6 Audio Physic Avanti III, cumulative spectral-decay plot at 50" (0.15ms risetime). The three earlier Audio Physic speakers from Joachim Gerhard that I tried—the Tempo, Step, and Virgo—all impressed me with their solid engineering and excellent sound quality. The Avanti III exceeds my expectations.—John Atkinson
