The aim of this paper is to determine experimentally the behavior of the ferrofluid seals used in loudspeaker having no viscoelastic suspensions [1]. In this case, the ferrofluid is saturated by a strong magnetic field (300-500 kA/m) relatively to its magnetization (9-32 kA/m). Two parameters are investigated: the radial stiffness that centers the moving part and the axial damping influencing the dynamic response of the loudspeaker. These parameters are measured as function of ferrofluid volume, magnetization, viscosity, shear rate and frequency of oscillation. The behavior is found coherent with the results of literature for relatively weak magnetic fields.