MEASUREMENTS

hen a loudspeaker is measured, the underlying assumption is that the distance from the speaker to the microphone is significantly greater than the largest dimension of the speaker’s drive-unit array.1 With conventional moving-coil loudspeakers, this assumption is almost always correct: The microphone is in the speaker’s farfield, where any differences in the path lengths from all the drive-units are negligible. However, with a panel loudspeaker such as the Magnepan LRS, this becomes difficult to arrange. The LRS’s Magneplanar panel is 38" tall by 10" wide, which means that, at my