SLAAE48 May   2025 TAS5825M

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Smart Amp Fundamentals
    1. 2.1 Speaker Basics and Models
    2. 2.2 Smart Amp Algorithm
  6. 3Preparation Work
    1. 3.1 Hardware Preparation
    2. 3.2 Software Preparation
    3. 3.3 Speaker Information
  7. 4Speaker Characterization
    1. 4.1 Characterization Set-up
    2. 4.2 Characterization Process
    3. 4.3 Speaker Characterization Guide
      1. 4.3.1 Hardware Connection
      2. 4.3.2 Power Up
      3. 4.3.3 Software Configuration
      4. 4.3.4 Speaker Characterization
        1. 4.3.4.1 Preparation
        2. 4.3.4.2 Speaker Type Selection
        3. 4.3.4.3 IV Measurement
        4. 4.3.4.4 Determine BL
        5. 4.3.4.5 Thermal Measurement
        6. 4.3.4.6 SPL Measurement
        7. 4.3.4.7 Safe Operating Area
        8. 4.3.4.8 Speaker Model Export
  8. 5Smart Amp Tuning and Verification
    1. 5.1 Smart Amp Tuning Guide
      1. 5.1.1  System Check
      2. 5.1.2  Choose Processing Flow
      3. 5.1.3  Import Speaker Model
      4. 5.1.4  Analog Gain Setting
      5. 5.1.5  Adjust System Gain
      6. 5.1.6  Equalizer Setting
      7. 5.1.7  Smart Bass Tuning
      8. 5.1.8  Bass Compensation
        1. 5.1.8.1 Corner Frequency
        2. 5.1.8.2 Alignment Order and Type
      9. 5.1.9  Max Level Tuning
        1. 5.1.9.1 Xmax
        2. 5.1.9.2 LAE Frequency
        3. 5.1.9.3 Power Limit
        4. 5.1.9.4 Attack, Decay, Energy
      10. 5.1.10 Anti Clipper
    2. 5.2 Smart Amp Verification
      1. 5.2.1 SPL Response Verification
      2. 5.2.2 Thermal Protection Verification
  9. 6Summary
  10. 7References

4.3.4.4 Determine BL

On the Speaker Details page, type in the area or diameter of your speaker’s diaphragm, as described in Section 2, and click the Next button.

On the Force Factor (BL) page, the recommendation is to use the Added Mass Method, rather than the Enter BL Method, to acquire the BL parameters. Click the Added Mass Method button to continue the characterization.

According to the instruction on Added Mass Specification page, get some adhesive putty as the mass, and use the weight scale to get the accurate weight of the mass, and type in the measured value. The suggestion is to make the mass to be approximately 20% of the speaker moving mass. If the moving mass is not given, use a putty ball that is roughly 1/5 the diameter of the speaker.

Add the mass to the target diaphragm of the speaker as described in the Added Mass Specification page, as shown in Figure 4-9, and click the Mass Added button to start the BL measurement process.

TAS5825M Examples of Added Mass MethodFigure 4-9 Examples of Added Mass Method

Wait until the Added Mass IV Measurement and the Find BL by Added Mass steps are completed, then remove the mass and click the Next button on the Remove Added Mass page.

TAS5825M Electromechanical Model Fitting ResultsFigure 4-10 Electromechanical Model Fitting Results

Wait until the Run Model Fit is completed, please review the fitted models on the Review Speaker Model page, as shown in Figure 4-10.

First, make sure that the light blue curve (measured impedance) aligns well with the dark blue curve (fitted impedance).

Next, compare the Re and fs value of the modeling results with the Thiele/Small parameters of your speakers. There cannot be a huge gap between the modeled and the rated values.

Finally, check the Impedance Error in Fit Error part, and the suggestion is to keep the impedance error less than 1%. If the model fits well, click the Accept button to move on to the next step. If not, you’re suggested to check your hardware and software configuration, check the added mass and the related data, and click the button to redo the BL measurement.