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    MEASUREMENTS

    May 12, 2020 4 minutes
    —John Atkinson

    I used DRA Labs’ MLSSA system to measure the Totem Skylight’s farfield behavior with a calibrated DPA 4006 microphone. For the speaker’s nearfield responses, I used an Earthworks QTC-40 mike, which has a small, ¼"-diameter capsule that doesn’t obstruct the sound from the woofer or port.

    Totem specifies the Skylight’s sensitivity as “88dB,” presumably for 1W at 1m. My estimate was 85.4dB(B)/2.83V/m, which is about what I would anticipate from such a small loudspeaker. However, while the Totem Skylight’s nominal impedance is specified as 8 ohms, the solid trace in fig.1 suggests that 10 ohms would be more accurate; this would increase the sensitivity expressed in terms of watts, but only by about 0.1dB.

    The impedance magnitude remains

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