Magnet-Only Loudspeaker Magnetic Circuits: A Solution for Significantly Lower Current Distortion

Merit B, Novak A. Magnet-Only Loudspeaker Magnetic Circuits: A Solution for Significantly Lower Current Distortion. J Audio Eng Soc. 2015;63(6):463-474. doi:10.17743/jaes.2015.0051

@article{Merit2015_17825,
  author = {Merit, Benoit and Novak, Antonin},
  title = {{Magnet-Only Loudspeaker Magnetic Circuits: A Solution for Significantly Lower Current Distortion}},
  journal = {Journal of the Audio Engineering Society},
  volume = {63},
  number = {6},
  pages = {463--474},
  year = {2015},
  month = jun,
  publisher = {Audio Engineering Society},
  doi = {10.17743/jaes.2015.0051},
  url = {https://doi.org/10.17743/jaes.2015.0051}
}

TY  - JOUR
TI  - Magnet-Only Loudspeaker Magnetic Circuits: A Solution for Significantly Lower Current Distortion
AU  - Merit, Benoit
AU  - Novak, Antonin
T2  - Journal of the Audio Engineering Society
J2  - J. Audio Eng. Soc.
VL  - 63
IS  - 6
SP  - 463
EP  - 474
PY  - 2015
DA  - 2015/06/06
DO  - 10.17743/jaes.2015.0051
UR  - https://doi.org/10.17743/jaes.2015.0051
PB  - Audio Engineering Society
LA  - en
AB  - When the motor of a classical electrodynamic loudspeaker has been replaced by a so-called magnet-only motor, current distortion caused by magnetic circuits is significantly reduced. All of the nonlinear soft-iron pieces are removed, and the magnetic field is created by a combination of permanent magnets. Two loudspeakers are compared in the study: the first sample is a mass-produced 6.5-inch loudspeaker. The second sample is built replacing the magnetic circuit of the first loudspeaker by the magnet-only structure. Thus, the moving parts, including the voice-coil, diaphragm, and suspensions are kept identical for both samples, leading to a comparison based only on their motors. The measurements on the original loudspeaker have shown a significant variation of apparent resistance and inductance of the voice-coil with current, displacement, and frequency. Conversely, the measurements on the magnet-only loudspeaker have shown almost no variation whatever the frequency, current level, or position of the voice-coil.
ER  -