Using WT3 to Measure a Woofer's Parameters
The basic steps to measure a driver's parameters are as follows. Before starting, be sure the unit has been calibrated.
•Start by connecting the WT3 hardware unit to a USB port on your PC.
•Next, launch the WT3 software.
•Make sure that the woofer is not connected to any other equipment and then connect the test leads of the WT3 unit to the terminals of the speaker under test.
•Raise the Windows volume control to maximum.
•Click the "Measure Free Air Parameters" button at the left side of the WT3 screen.
•You should hear the sweep from the speaker, the impedance is plotted and the parameters are displayed.
•Select a method to measure V(as), enter the required data and click on the "Measure V(as)" button.
After measuring a speaker you may want to enter additional information (say, the manufacturer and model of the speaker) at the Driver Editor. Then save the measurement to an empty memory. As an example, the keyboard sequence "Alt + 1" saves new data to memory 1.
Here is a typical measurement result: