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Motor + Suspension Check (MSC)

Optional Modules for the KLIPPEL QC Framework

Features and Benefits

  • Patented nonlinear parameter measurement for QC
    • Voice coil offset in mm
    • Stiffness asymmetry in %
  • Root cause information for diagnostics and process control
  • Ensure maximum output and reliability
  • Ensure consistency of production
  • Ultra-fast testing at physical limit
  • No additional sensors required (based on V, I)

The QC Motor + Suspension Checkis a unique tool for high-speed  identification of nonlinear driver parameters on the production line. Based on patented KLIPPEL technology, effective linear and nonlinear parameters (Bl(x) and Kms(x)) are identified in order to derive meaningful single value parameters like voice coil offset and suspension asymmetry. This provides valuable information for taking immediate action to fix the causes of loudspeaker distortion, maximum output limitation or stability issues. The driver under test may be operated in free air as well as in sealed or vented enclosures, giving additional enclosure parameters (fbQb). Neither microphones nor mechanical sensors (lasers) are required, as all information is provided by the electrical input current, making the measurement immune to ambient noise.

Test Objects

The MSC can be applied for testing:

  • (Sub)woofers
  • Midrange drivers
  • Micro-speakers
  • Headphones
  • Tweeters
  • (Sub)woofer or midrange drive unit in vented box
  • Actuators (shakers, LRAs)

Demo Experiment

The figure below illustrates the sensitivity of the MSC by measuring the influence of gravity on the voice coil rest position using very tight limits. The measured value of corresponds to the predicted value based on lumped loudspeaker parameters.



License Dongle (USB)




Related Information

Other Modules of the QC System
Balanced Armature Check (BAC):
  Test armature offset of BA drivers for earphones and hearing aids 
T/S Parameter Laser Fitting (TSX) add-on for Impedance Task (IMP):
  Thiele Small parameter identification with laser

General Features of the QC System
Comprehensive Testing
Fast as a Flash

Related Products 
Large Signal Identification (LSI):
Linear Parameter Identification (LPM):
  Identification of linear electrical and mechanical parameters
Suspension Part Measurement (SPM):
  For linear and nonlinear testing


Germany: 102007005070; US;8,078,433B2; China: ZL200810092055.4; Japan: 5364271; India: 162/DEL/2008; Germany: 1020120202717; USA: 10,110,995; China:201380054458.9; Korea:10-2015-7012390; Taiwan: 102137485; India: 844/MUMNP/2015