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About us

The Klippel GmbH is a innovative German company founded by Prof. Wolfgang Klippel in 1997 to produce novel control and measurement systems for loudspeakers. The current developments are based on the results of loudspeaker research performed over nearly 20 years and published in numerous scientific papers and patents. Wolfgang Klippel contributed to the development of large-signal models for loudspeakers which are the basis for digital compensation of the nonlinear distortion. His pioneering work was recognized by awards of the Audio Engineering Society.

» Our Vision

Smaller Drivers

Digital signal processing has revolutionized the sound reproduction systems in the last ten years, setting a high standard of sound quality not possible in the analog era before. The loudspeaker - the final link to the listener - generates a high amount of audible distortion at maximal signal amplitudes. Instead of operating large speakers far below the mechanical limits we believe in small and lightweight speakers generating high acoustic output at high accuracy and efficiency using less natural resources. 


Large Signal Performance 

Listening as well as objective measurements are the tools for designing better speakers and for sustaining high quality in manufacturing. A Linear Driver Model and the measurement of the amplitude and phase response fail at high signal amplitudes. Conventional harmonic and intermodulation measurements show that the driver is somewhere nonlinear but can not describe the cause of the distortion. We are developing novel measurement techniques which quantify the nonlinearities directly and which measure their contribution to the total distortion while reproducing an audio-like signal.


Coping with Driver Nonlinearities

The large signal parameters give direct indications about the physical cause of the distortion. Some of the problems can be fixed at low cost by improving the voice coil position and by the assembling of the suspension. Other nonlinearities are directly related to other desired properties of the speaker such as efficiency and size. To find the optimal solution for the particular application the engineer needs better simulation tools to predict the final performance in the large signal domain. Digital signal processing applied to nonlinear driver modeling enables both engineering and marketing to listen to a virtual speaker before starting with prototyping and to define the final product more precisely in an early stage.


Digital Compensation of nonlinear speakers

We envision an active speaker bringing together the new possibilities of digital signal processing and the experience accumulated in the passive driver design. Electro dynamical drivers giving the highest output at a minimum of natural resources have a nonlinear motor characteristic. Coupled with an electric controller which is a self-learning nonlinear system dedicated to speakers and implemented in digital platforms at low cost will compensate undesired distortion, protect the driver against damage and preserve high performance over years of use.