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Dynamic Excursion Check and Control (DXC)

Option for SPL and EQA Task

Features and Benefits

  • Check excursion at EoL using laser
  • Check peak / bottom excursion
  • Check dynamic DC component
  • Define AC and DC target excursion for tests
  • Ensure critical and/or user specified excursion for distortion tests
  • Check instability of coil offset
  • Contact free excursion check

The DCX option is an add-on for the SPL and the EQA-Task of the Klippel QC-Software. It expands the acoustic test options of both tasks with laser measurement capability of transducer excursion. Mechanical excursion testing is a valuable method to check the maximal displacement and the frequency dependent voice coil or diaphragm position. Note that also electrical methods based on modeling can assess those parameter (MSC module). 
The SPL task with DCX option can check the envelope, the peak/bottom excursion and the dynamically generated offset of the coil position, which is a crucial property of voice coil stability. The EQA task with DCX option can control the excursion of any transducer to a given target envelope and even compensate for dynamic coil offset. With this option a maximum excursion can be defined and a level profile derived that can be applied in a following measurement step by the SPL task for actual measurement. Since excursion is a dominant cause of nonlinear distortion, critical distortion tests can be designed that represent a worst-case operation scenario.


KA3 Hardware
with Laser Card (see Specification H3)

Power Amplifier (QC-Card, AMP-Card, external power amplifier)
Laser Displacement Sensor (see Specification A2)

Optional - Adjustment gear for calibration: 
Micro-speaker clamping 
Translation stage

QC Standard Software 6.3 or SPL-Task license for R&D application (dB-Lab 210.560)
EQA-Task License (if control option is required)
DCX add-on is not available in QC Basic software

Related Information

Other Modules for the KLIPPEL QC System
Equalization & Alignment (EQA)
Sound Pressure Task (SPL)
Motor + Suspension Check (MSC)

Literature and Papers
W. Klippel: Loudspeaker Nonlinearities – Causes, Parameters, Symptoms. J. Audio Eng. Soc. 54, No. 10 (2006), 907-939
W. Klippel, S. Irrgang, U.Seidel, “Loudspeaker Testing at the Production Line” presented at the 120 Convention of the Audio Engineering Society, Paris, France , 2006 May 20-23, Paris
W. Klippel End-Of-Line Testing, Assembly Line - Theory and Practice, Prof. Waldemar Grzechca (Ed.), InTech, DOI: 10.5772/21037. (2011). Available from:
W. Klippel, J. Schlechter, “Fast Measurement of Motor Suspension Nonlinearities in Loudspeaker Manufacturing,” Journal of Audio Eng. Soc., Vol. 58, No. 3, pp. 115-125, 2009 March