19. AMPLITUDE-FREQUENCY RESPONSE, SPL19.1 SET-UP FOR THE MEASUREMENTSPL frequency response measurements are carried out in conjunction with the MICROPHONEIN socket. The speaker is connected to the speaker out.The selector is switched to SPL and the volume to 9dB (SPL).The picture do not show the rightselector position. It is SPL.19.2 THE SPL MEASUREMENTTo see the sensitivity for 1W/1m in the plot there is the SPL measurement .It is important that the Mic-sense be set in the MIC-CORRECTION menu.After opening the SPL active menuThere is to set the impedance of the speaker. With this information the box set the output powerof 1W.The next is to set the distance from the speaker to the microphone. If the distance is not 1m, theprogram calculates the right value.The function FREE OUTPUT CONTROLL sets the OUTPUT controller to set the SPL level forthe THD or IMD measurement.54
