Ferrofluids have been extensively used in audio speakers for over
25 years. They offer significant performance advantages in tweeters,
mid-ranges, woofers, compression drivers and automotive speakers.
Some of the advantages in using ferrofluid include increased power
handling apabilities, smoothing of frequency response curve and
reduced distortion. Ferrofluidics, the world leader in magnetic
fluid technology, offers a wide range of fluids for audio applications.
Ferrofluid resides in the air gap of the magnet
and completely fills the space between the coil OD/pole and coil
OD/top plate. No physical containment is needed as the fluid is
held in place by the strong permanent magnetic field.
The choice of ferrofluid depends on specific loudspeaker
requirements in terms of the damping required and the field in the
gap.Two key properties of the fluid determine the correct fluid
for any application: the viscosity and the magnetization value.
The higher the viscosity of a ferrofluid, the greater the viscous
damping of the moving mass. A fluid with the correct magnetization
value must be chosen to ensure retention of the fluid in the air
gap. All ferrofluids, independent of viscosity, essentially provide
the same heat transfer from the voice coil to the magnet structure.
Every speaker design is unique. Some speakers,
for example supertweeters, require only light damping but need very
high colloidal stability of the fluid, whereas tweeters often require
high viscosity fluids. To accommodate this there is a complete range
of ferrofluids with varying viscosity values and magnetization properties.
This means that whatever your requirements in terms of mechanical
damping and fluid retention, there is probably a suitable fluid
from one of our standard ranges. If not, our team of experienced
audio engineers can custom engineer a new fluid to meet the performance
objectives of your loudspeaker.
Ferrofluid | Vacuum
Feedthroughs | Thermoelectric Modules
Contract Manufacturing | Literature
Rack | Specialty Seals
Inertia Dampers | Electron