MEASUREMENTS

I measured the OMA Fleetwood DeVille’s farfield and nearfield behavior with the DRA Labs MLSSA system, using calibrated DPA 4006 and Earthworks QTC-40 microphones and an Earthworks microphone preamplifier. I used Dayton Audio’s DATS V2 system to examine the loudspeaker’s impedance magnitude and electrical phase.

OMA specifies the Fleetwood DeVille’s sensitivity as 94dB/W/m. My B-weighted estimate was lower, at 89dB(B)/2.83V/m, However, the DeVille’s impedance, specified as a nominal 8 ohms, averages closer to 15 ohms (fig.1, solid trace). A voltage of 2.83V is therefore equivalent to just over 0.5W. Increasing the voltage to 3.87V would result in 1W into 15