http://www.stereophile.com/content/wilson-audio-sophia-series-3-loudspeaker-measurements#KQDcxc4eHJR...
Sasha: Fig.3 shows the Sophia's step response on its tweeter axis. The initial up/down spike is the tweeter output; the negative-going decay of the tweeter's step blends smoothly into the midrange unit's step response, the positive-going decay of which blends smoothly into the start of the woofer's step response. (The tweeter and woofer are connected in positive acoustic polarity, the midrange unit in inverted polarity.) But if you look very closely at this graph, there is a slight depression just before the tweeter's step. This is the start of the midrange unit's negative-going step, which suggests that the Sophia's optimal axis—ie, where the outputs of the three drive-units optimally sum in the frequency domain—is actually just above the tweeter axis.
Read more at http://www.stereophile.com/content/wilson-audio-sophia-series-3-loudspeaker-measurements#5XggM8TqXbY...
Alexia: This graph reveals that, as in the Alexandria XLF, the tweeter is connected in positive acoustic polarity, the midrange driver in negative polarity. However, with the tweeter module set up by Peter McGrath, the graph also shows that the negative-going decay of the tweeter's step smoothly blends with the negative-going start of the midrange unit's step, confirming the excellent frequency-domain integration of their outputs seen in fig.4. Moving slightly above or below the intended axis destroys that smooth blending of step responses.
Read more at http://www.stereophile.com/content/wilson-audio-specialties-alexia-loudspeaker-measurements#YE4CzkkR...
Frequency domain isn't TIME DOMAIN.
Sasha: Fig.3 shows the Sophia's step response on its tweeter axis. The initial up/down spike is the tweeter output; the negative-going decay of the tweeter's step blends smoothly into the midrange unit's step response, the positive-going decay of which blends smoothly into the start of the woofer's step response. (The tweeter and woofer are connected in positive acoustic polarity, the midrange unit in inverted polarity.) But if you look very closely at this graph, there is a slight depression just before the tweeter's step. This is the start of the midrange unit's negative-going step, which suggests that the Sophia's optimal axis—ie, where the outputs of the three drive-units optimally sum in the frequency domain—is actually just above the tweeter axis.
Read more at http://www.stereophile.com/content/wilson-audio-sophia-series-3-loudspeaker-measurements#5XggM8TqXbY...
Alexia: This graph reveals that, as in the Alexandria XLF, the tweeter is connected in positive acoustic polarity, the midrange driver in negative polarity. However, with the tweeter module set up by Peter McGrath, the graph also shows that the negative-going decay of the tweeter's step smoothly blends with the negative-going start of the midrange unit's step, confirming the excellent frequency-domain integration of their outputs seen in fig.4. Moving slightly above or below the intended axis destroys that smooth blending of step responses.
Read more at http://www.stereophile.com/content/wilson-audio-specialties-alexia-loudspeaker-measurements#YE4CzkkR...
Frequency domain isn't TIME DOMAIN.