MAE - McIntosh Applied Engineering, LLC



Speaker Parameterization

 

MAE provides a speaker parameter service to provide parameters for all speaker transducer types including :

 

                -moving coil (also known as "dynamic")

                - piezo electric

                - balanced armature (single acoustic port devices commonly used in hearing aids)

 

Two types of parameters are provides:

 

                - Thiele-Small

                - Aeroelastic

 

The parameters are saved to a *.ARES_SPK file and can be directly imported into the Modeler's speaker element as shown below.

 

 

 

 

 

 

Import speaker parameters                       

 

 

 

 

 

 

 

The Thiele-Small parameters can also be provided in text format.  Aeroelastic parameters are a proprietary set of parameters that can only be provided in the *.ARES_SPK binary file format.

 

 

Thiele-Small Parameters

 

The Thiele-Small parameters are specific to moving coil speakers and have many forms.  Ares supports two different forms.  These are:

 

Thiele-Small parameters 1

                Re           - DC resistance of voice coil (ohms)

                 Le          - inductance of voice coil (H)

                BL           - magnetic motor force (T-m)

                Do          - radiating diameter of cone (m)

                                  (for non-circular cones, this represents the effective radiating surface area)

                Mm        - moving mass of cone (kg)

                Cm         - compliance of cone (mm/N)

                Rm         - mechanical resistance of cone (mechanical ohms, N-s/m)

 

Thiele-Small parameters 2

                Re           - DC resistance of voice coil (ohms)

                 Le          - inductance of voice coil (H)

                BL           - magnetic motor force (T-m)

                Do          - radiating diameter of cone (m)

                                  (for non-circular cones, this represents the effective radiating surface area)

                Fo           - resonant frequency of mechanical cone system (Hz)

                Qms       - Q of mechanical cone resonant system (dimensionles)

                Vas         - equivalent air volume of the "acoustic suspension" (m3)

                                  Vas represents the volume of air that has the same compliance as Cm.

 

Note that the Thiele-Small parameters 1 and 2 represent the same system, but just represented using different parameters.

 

Aeroelastic Parameters

 

Aeroelastic parameters are useful for parameterizing virtually any type of linear acoustic transducer technology including moving coil, piezo electric, or balanced armature.  For devices which only have a single acoustic port (such as most balanced armature speakers), only the front speaker port is used in the Modeler.

 

For moving coil speakers, the Aeroelastic parameters capture the low frequency suspension relaxation as well as the effects of the cone's high frequency modes.  The graph below shows the modeled frequency response of a speaker radiating into free space.  The response for both the Thiele-Small and Aeroelastic parameters are shown.  Note that the magnitude plot shows that the Aeroelastic parameters capture more high frequency detail than the Thiele-Small parameters.  The low frequencies are also different as can be seen in both the magnitude and phase plots.  This is important in applications where the phase behavior is important such as in active noise control.

 

 

 

Ares model for the above graph.

                               

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