This dialog provides five different methods of generating speaker parameters.  Moreover, the parameters generated can be produced for two different models: Standard or LEAP. 

Full optimization of the model parameters to the original impedance curves is provided for maximum accuracy.  Native unit conversions are provided for all parameters. 

The dialog also provides the means to generate impedance curve simulations based on the derived parameters. This allows for easy viewing and comparison of the model to the measured impedance data.

The graph here shows a pair of typical impedance curves produced from a delta-mass measurement.

This was a 15 In woofer and 100 grams of mass was added to produce the delta curve.

After processing, the speaker parameters as shown below were produced.

The parameters will be generated with whatever units the user has selected.

The parameters can then be saved as a text file, transferred to the clipboard, or printed.

* LMS(TM) 4.1.0.249 Sep/15/2000
* (C)1993-2000 by LinearX Systems Inc
* ElectroMech Speaker Parameters
* Sep 28, 2000 Thr 5:17 pm
* Library=Spmtests.lib
* Reference Curve=15" in free air
* Delta M/C Curve=15" +100G DM
* Method= Double Curve - Delta Mass
* Domain= FreeAir, Model= LEAP
Revc= 6.200 Ohm
Fo= 27.962 Hz
Sd= 88.000m sqM
Krm= 19.137m Ohm
Erm= 0.709
Kxm= 6.816m Ohm
Exm= 0.740
Vas= 364.188m cuM
Cms= 331.186u M/N
Mmd= 82.812m Kg
Mms= 97.822 g
BL= 19.473 TM
Qms= 3.691
Qes= 0.281
Qts= 0.261
No= 2.700 %
SPLo= 96.395 dB

The graph here shows the simulation results based on the newly derived parameters.

The Red curve shows the free air simulation, and the Blue curve the delta-mass simulation.

A copy of the complete set of numeric parameters is also placed automatically into the note area of the graph. The parameters which created the curves are printed with the graph curves.

The new Transducer Model Derivation (TMD) dialog contains the ability to produce parameters for 3 different transducer models: Standard (STD), LEAP-4 (TSL), and LEAP-5 (LTD).

The LTD model was developed for LEAP-5 and provides extremely advanced behavior modeling capabilities for electrodynamic transducers. A comparison of the three different models and real driver behavior is given in the following link.

Transducer Model Comparison

Extensive parameter fields are provided in the TMD dialog. Multiple impedance curves are input by the user taken under different drive conditions, delta mass, and temperature. Numerical optimization techiques are used to fit the parameters to the data curves.

The results of the model simulation are compared directly against the imported measured data. Each measured impedance data curve can be compared to the matching model curve.

The parameter graph tab provides a graphical view of various key parameters of the transducer. Many of these parameters are both frequency and/or level dependent in the case of the LTD model.