Sonus Faber Amati Homage loudspeaker Measurements part 2
Fig.4 Sonus Faber Amati Homage, low-frequency acoustic crossover, measured in the nearfield.
To the left in fig.5 is shown the complex sum (amplitude, phase, and distance from the mike, assuming a nominal farfield mike position) of the individual responses shown in fig.4. The coincidence of the woofers and midrange unit in the upper bass appears to give a peak at 65Hz, with what is more like a sealed-box, 12dB/octave rolloff below that frequency. An enigma!
Fig.5 Sonus Faber Amati Homage, anechoic response on tweeter axis at 50", averaged across 30 degrees horizontal window and corrected for microphone response, with the complex sum of the nearfield woofer, midrange, and port responses plotted below 300Hz.