Compensation of the flux modulation distortion using an additional coil in a loudspeaker unit

Niccoló Antonello, Finn T. Agerkvist

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


Flux modulation is one of the main causes of distortion in electrodynamic loudspeaker units. A new compensation technique that eliminates this type of non-linearity using an additional compensation coil in the speaker unit is presented. An equivalent circuit model of the device including the compensation coil is derived. The compensation technique consists on feeding the compensation coil and voice coil with filtered versions of the wanted audio signal. Simulations show that a significant reduction in flux modulation distortion can be achieved with this technique. A simple magnetic circuit has been constructed to test the method on a real device, and the measurements show the method works, also when eddy currents are present.
Original languageEnglish
Title of host publicationProceedings of 137th Audio Engineering Society Convention 2014
Publication date2014
Article numberConvention Paper 9160
ISBN (Print)9781634397483
Publication statusPublished - 2014
Event137th Audio Engineering Society Convention - Los Angeles, United States
Duration: 9 Oct 201412 Oct 2014
Conference number: 137


Conference137th Audio Engineering Society Convention
Country/TerritoryUnited States
CityLos Angeles


  • Modeling and Simulation
  • Acoustics and Ultrasonics
  • Eddy currents
  • Electric coils
  • Modulation
  • Audio signal
  • Compensation coil
  • Compensation techniques
  • Electrodynamic loudspeakers
  • Equivalent circuit model
  • Flux modulation
  • Voice coil
  • Loudspeakers


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