I used DRA Labs’ MLSSA system with a calibrated DPA 4006 microphone to measure the Acelec Model One’s behavior in the farfield and an Earthworks QTC-40 mike for the nearfield responses. I measured the speaker’s impedance magnitude and phase with Dayton Audio’s DATS V2 system.
The Model One’s specified sensitivity is 84dB/W/m; my B-weighted estimate was within experimental error of that figure, at 84.1dB(B)/2.83V/m. lies below 3 ohms between 92Hz and 240Hz, with a minimum value of 2.18 ohms at 124Hz, a frequency range where music can have high energy. The Model One needs to be used with amplifiers that don’t have problems driving low impedances.
