Included with the Woofer Tester 2:
• Test unit
• CD-ROM with Software
• 1 USB A/B Cable
• 1 Set of Test Leads
• 1 Banana plug with Calibration Resistor
• Downloadable User Guide
• Free Software Upgrades & Support

System Requirements:
• Pentium 450 MHz or faster
• USB Port
• Windows® Vista, XP, 2000, Me or 98SE

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Description

Thiele-Small Driver Measurement

With the Woofer Tester 2, measuring a driver's Thiele-Small parameters is easy. Q/FS, Vas and motor parameters are measured with a single click of a button, as shown below. Vas can be measured with the Delta Mass, Delta Box or Efficiency method.

For Impedance & Phase testing, a fast, under 1 second, test mode is also available. This is useful for crossover design or a quick, production line test of a driver. Various Impulse, MLS, Noise, Sine test signals are available in fast mode. Note that this mode is not as precise and is not recommended in a final speaker design. Additionally, the Woofer Tester 2 allows you to see the Cms trend versus drive level.

                            Single-Button Q/FS, Vas                          Thiele-Small Parameters
                            & Motor Parameter Tests                                                                   Click image to enlarge
                               


Advanced Thiele-Small Simulator & Box Analyzer

The Woofer Tester 2 includes an advanced Thiele-Small Simulator that models Frequency Dependent Inductance that vastly improves measurement results over existing methods.

The Box Analyzer models vented, sealed, band pass and passive radiator designs. Additionally, it calculates box, port and stuffing losses and measures response, impedance, phase, velocity & xmm. The advanced features in the analyzer allow you to account for room or car pressurization effects as well as vent resonances otherwise known as pipe organ effects. Driver compression effects can also be selected from the compression measurement table.



Box Alignment

The Woofer Tester 2 introduces a new way to conduct box alignment that takes the guesswork out of using Fsb, Ha and Alpha values only to find that the finished box doesn't produce the expected response. Our new method automatically aligns the simulator to the measured box data finding the effective box size, tuning and losses. Simply click on the SimRX button to see the actual response.



As shown in the two graphs below, the simulated and actual results match closely and produce superior results to any traditional method. We also calculate the traditional Fsb, Ha and Alpha values and measure in-box electrical impedance.

   

Speaker Builder's Toolkit

Also included in the Woofer Tester 2 are a number of tools to help you with your speaker design. One of them is the Air Core Inductor Design tool that calculates the layers, number of turns, DC resistance, weight and length of wire required.

Another capability allows you to measure small and large capacitors. The capacitor measurement alignment tool measures and nullifies the tester's parasitic components. This enables the measurement of capacitor values less than 100pF.

For oval shaped drivers, there is an ellipsoid calculator that calculates the correct driver area. This is important for measuring Vas correctly, as applying a circular diameter to an oval driver yields incorrect results.

Atmospheric conditions have an impact as well and the Woofer Tester 2 allows you to adjust them to fit your environment by entering temperature, barometric pressure and humidity values.



Zobel Compensation Networks and T/S Tank Circuit

As part of the more advanced crossover design features, the Woofer Tester 2 can be used to find a Zobel Compensation Network and it includes a T/S Tank Circuit calculator as well. While simple, off-the-shelf crossovers designs assume resistive loads, they ignore the fact that all speakers have some amount of voice coil inductance. A Zobel Compensation Network accounts for voice coil inductance making a speaker appear resistive.

The T/S tank circuit calculator is used for simulators that model driver impedance as RLC components.




Crossover Component & Cable Measurement

The Woofer Tester 2's large dynamic range and utmost precision allows it to measure impedance and phase continuously from 1 to 20 kHz with 5-digit accuracy typical when used at full scale. With electrical ranges of 100 pF - 1000 uF, 100 nH - 10 H, 10 milliohm - 100 kohm range, it easily measures speaker cables as well.

Change in Inductance of 36" Leads Open/Closed            10 ohm cal resistor: 1 milli-ohm/div, 1-20 kHz
50 milli-ohm/div