The Woofer Tester 2, our base model, is packed with advanced features and is great for the serious speaker builder looking for an ultra-compact precision tester. What's more - all our testers are fully integrated and we make it easy to progress to our more advanced models. Plus, you get free software updates and support.

Hardware Features:
• Self-Powered from USB port
• Low-level Line Output
• Dimensions: 2.6" x 2.6" x 1.1"

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® Win8,Win7,Vista,XP,2k,Me or 98SE

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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. Vas can be measured with the Delta Mass, Delta Box or Efficiency method. The tester's sophisticated model takes phase-plug area into account as well.

For Impedance & Phase testing, a fast, under 1 second, test mode is available. This is useful for crossover design or a quick, production line test of a driver. Various Impulse, MLS, Noise, Sine, Chirp 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
                     wt2_singleQFS_small.gif           wt2_tsparameters_small.gif

Advanced Thiele-Small Simulator & Box Analyzer

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

The Box Simulator 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 be selected from the Test Environment, AC compression measurement table, or a manufacturer's data sheet.


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 in-box impedance data and finds the effective box size, tuning and losses. In addition, it can be turned around to refine your driver parameters if they have shifted due to drive level, temperature, break-in or box and driver interaction.


As shown in the two graphs below, the simulated and actual results match closely and produce superior results to any traditional method using Fsb, Ha and Alpha (those are provided as well). Auto alignment works for both sealed and vented boxes, even when the driver and box interaction has shifted the initial design parameters.

wt2_boxalignment2_small.gif    wt2_boxalignment3_small.gif

32 Dual Data Buffers for Testing and Overlays

The large number of dual data buffers available enables you to construct intricate graphics overlays and setup complex testing scenarios. Each data buffer stores two data points; hence the name 'dual buffer'. The data points stored can either be Impedance, Phase, Response, Displacement or Velocity and are indicated in the Info column of the Overlay setup control (pictured below).

All data buffers are controlled from the Overlay setup control. To write to any buffer, simply select it from the list. With an additional click, name it as you wish. Then, select the checkbox on the left to display the data in the Overlay window. Easy!

Response and phase offsets as well as phase wrapping and polarity are also set here. You can either manually enter them or use the offset calculator, which automatically finds the difference between the desired and measured value for you!


Setup Control Window

The Setup Control window lets you configure your test environment. Test signals, buffers, sampling rates, graphing options and data buffers are all controlled from here.


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.

aircoreinductor.gif wt2_capacitormeasure_small.gif

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

crossovercomponent1.gif crossovercomponent2.gif



• Precision Thiele-Small
  Measurement System using
  Constant Current Source

• Advanced T/S Simulator
  with Frequency Dependent Le

• Box Analyzer for
  Sealed, Vented, Passive
  Radiator & Band Pass Boxes

• Automatic Box Alignment
  finds Effective Box Size,
  Tuning and Losses

• 14 different Test Signals

• Single Button Q/Fs, Vas
  and Box Test

• Direct Measurement of
  Amplitude & Phase using
  DSP Filtering
  (not FFT interpolation)

• .001 Hz resolution from
  1-20 kHz
  (measure very low Fs drivers)

• Measures Voice Coil and
  Suspension Compression

• RLC and Cable Measurement
  in 100pF-1000uF, 10nH-10H,
  and .01-100K ohm Ranges

• 32 Dual Buffers for Overlays

• Fast,< 1 Second, Real-Time
   Impedance and Phase
  (Impedance sweeps)

• Line Level Outputs for
   Driver Break-in

• Zobel, T/S Tank &
  Air Core Inductor Calculators

• Export to ZMA, Bass Box Pro,
  Leap and Text File Formats

• Upgrade Path to Speaker
  Tester and Woofer Tester Pro

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