The signal ascends steeply and falls in correspondence with the e – function. The descent iscaused by the differentiating function of the air.The picture shows an ideal loudspeaker. The steep ascent of the step response displays a hightop frequency border. The e – function’s corresponding descent shows a linear frequencycharacteristic. The lower frequency border can be deducted from the steepness of descent. Thedeciding factor in this measurement though is the statement brought about by the phaserelation.Because the step response only shows ascent and descent this means that all loudspeakers areon the same acoustic level and are poled identically. The phase is also linear. Averageloudspeakers display many peaks and falls depending on the number of single chassis.22.2 THE MEASUREMENTThe step response is not a measurement on it’s own but an evaluation of frequencycharacteristic and phase.The window for the display is activated with the button:The plot shows the electrical measurement.The display for the lower and top frequencies is adjusted under the curve. The scale for the x –axis is in msec. It can set with the START-F controller.66
