Speaker Suspension

This part of a speaker assembly consists of the surround and the spider. The suspension fulfills several purposes: it centers (both axially and front to back) the voice coil in the gap of the magnet and it exerts a restoring force to keep it there. The suspension limits the maximum mechanical excursion of the diaphragm and voice coil. It determines the compliance of the driver and, together with the mass of the moving parts, determines the resonance of the driver. Ideally, the suspension should provide a linear restoring force on the diaphragm and voice coil over its full range of excursion.