Want to capture more detailed mechanical behavior during long-term loudspeaker testing? AN83 shows how to connect laser-based displacement sensors to the KLIPPEL Endurance Test (KET) using an external script and the system’s API.

Track peak, bottom and dynamic DC offset displacement values over time and gain deeper insights into loudspeaker durability and fatigue.

Discover how to upgrade your KET measurements » Application Note AN83

📅 Dates: September 29th to 30th, 2025
🕘 Duration: 9 am – 5 pm (both days)
📍Location: Dresden, Germany
Presented by KLIPPEL Support and Development Engineers

The 2-day seminar is designed to enhance your knowledge of the KLIPPEL Analyzer System and is divided into two parts, one for R&D and one for QC measurement. We will focus on the basics, target applications and tips and tricks for working with dB-Lab and the respective Klippel tools in your daily work. You will also receive an in-depth overview of the Klippel product landscape along with background information.

We look forward to seeing you! » More detailed information on our website.

Optimal Voice Coil Rest Position

In dynamic transducers such as loudspeakers, shakers and headphones, the precise rest position of the voice coil in the magnetic gap plays a critical role in overall performance. A coil offset from the symmetrical center of the magnetic field introduces unwanted signal distortion and can cause a dynamic DC displacement. This shift in the coil’s rest position toward the gap edges reduces the system’s stability and efficiency.

This Application Note AN1 outlines how measuring the symmetry of the force factor Bl as a function of displacement x helps identify and correct these asymmetries. Using the Large Signal Identification (LSI) module, engineers can dynamically evaluate the Bl(x) curve under normal operating conditions. Post-processing tools further support interpretation by quantifying the required offset (xB) to restore the optimal rest position.

By optimizing this parameter, designers can significantly reduce distortion and enhance driver performance, particularly in high-excursion applications.

Curious how to identify and correct nonlinear asymmetries in your transducer design? Download the full Application Note AN1 and explore the deeper theory in the related paper: “Diagnosis and Remedy of Nonlinearities in Electro-dynamical Transducers” by Wolfgang Klippel.

These sets support you in selecting measurement system setups to make your workflows more efficient, especially for R&D and quality control applications.

A new Module Bundle for Max SPL & Distortion Testing is now also available. It combines several KLIPPEL R&D modules into a cost-efficient package, designed to streamline loudspeaker evaluation and accelerate development. Detailed information on this solution will be featured in the upcoming newsletter.

For further details or to explore how these updates support your workflows, contact Customer Experience Manager Danny Rieger at d.rieger@klippel.de.

Did you know that nonlinear inductance in electro-dynamic transducers can degrade the audio experience? This phenomenon, caused by the voice coil’s position- and frequency dependent self-inductance, leads to voltage sensitivity loss and nonlinear distortion that impacts the sound quality.

Our latest scientific article tackles this issue head-on by presenting a new, faster measurement technique for capturing frequency-dependent nonlinear inductance and magnetic losses. By using a fast full dynamic measurement method that uses a multi-tone stimulus, we can now generate a more accurate, dynamic nonlinear inductance model. The results help to increase the transducer performance, reduce the distortion and improve the sound reproduction quality.

Discover all the full details in our recent paper. Let’s take your transducer testing to the next level and discover the new speaker model that is the basis of our new KLIPPEL R&D module Fast Large Signal Identification (FLSI Pro)! A pre-release version is available now.