Mechanical Overload Protection of Loudspeaker Systems

Klippel W. Mechanical Overload Protection of Loudspeaker Systems. J Audio Eng Soc. 2016;64(10):771-783. doi:10.17743/jaes.2016.0017

@article{Klippel2016_18519,
  author = {Klippel, Wolfgang},
  title = {{Mechanical Overload Protection of Loudspeaker Systems}},
  journal = {Journal of the Audio Engineering Society},
  volume = {64},
  number = {10},
  pages = {771--783},
  year = {2016},
  month = oct,
  publisher = {Audio Engineering Society},
  doi = {10.17743/jaes.2016.0017},
  url = {https://doi.org/10.17743/jaes.2016.0017}
}

TY  - JOUR
TI  - Mechanical Overload Protection of Loudspeaker Systems
AU  - Klippel, Wolfgang
T2  - Journal of the Audio Engineering Society
J2  - J. Audio Eng. Soc.
VL  - 64
IS  - 10
SP  - 771
EP  - 783
PY  - 2016
DA  - 2016/10/06
DO  - 10.17743/jaes.2016.0017
UR  - https://doi.org/10.17743/jaes.2016.0017
PB  - Audio Engineering Society
LA  - en
AB  - Generating sufficient acoustical output with smaller loudspeakers requires maximum voice coil excursion, thereby exploiting the available mechanical resources of the motor and suspension. Digital preprocessing of audio input signals can be used to prevent a mechanical or thermal overload, which would generate excessive distortion and eventually damage the transducer. The most important characteristics of the protection algorithm are the measurement or adaptation error for the critical state variables, overshoot and undershoot of the activation control system, and latency added by the protection system. An inexpensive adaptive protection scheme can be realized by monitoring the voltage and current at the transducer terminals without using a mechanical sensor. The adaptive nonlinear control generates not only the largest AC amplitude and maximum output but also reduces the nonlinear distortion. The active linearization and stabilization of the transducer also needs a reliable mechanical protection system because overshooting the protection limits will cause an undesired increase of the nonlinear compensation signal, and that would require power amplifiers to provide a higher peak voltage.
ER  -