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Upcoming Seminar:
"Loudspeaker
Measurement"
Lone Star Audio Fest
May 2-4, Dallas TX
Details
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Introduction
The Vented Box test button tells the software to collect the following information:
- Frequency of low side impedance peak
- Frequency of zero phase crossing between the impedance peaks
- Frequency of high side impedance peak
These data points are then used to compute the Ha, Alpha, Fsb and Fbox parameters as described in Vance Dickason's
Loudspeaker Design Cookbook. The Woofer Tester software goes a step further. Follow these steps:
- Open the 'Data Overlay' and 'TS Entry' windows
- Enable 'Box' and 'SimZP' in the 'Data Overlay' window
- Copy the driver's TS parameters to the simulator by clicking 'Copy Test->Sim'
- Next click on 'Cvrt Vbox->Sim'
If the TS parameter and vented box data is correct, the tested and simulated impedance plots should line up.
Here is an example:
Click Image to Enlarge
Next, disable the impedance plots and look at the simulated speaker, driver or port response. This example shows the
simulated and close microphone response of the driver as measured with the Speaker Tester. The port for this box is
on the back side allowing the measurement to be relatively un-involved. Measurements of the port and overall speaker
response were of equal quality
Click Image to Enlarge
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