An electrodynamic transducer includes a frame, a magnet assembly providing
a magnetic field across an air gap, a voice coil, a coil former for
supporting the voice coil in the air gap, and a diaphragm having an outer
perimeter and an apex. The coil former is coupled to the apex so that
current through the voice coil causing the voice coil to move in the air
gap causes the diaphragm to move. A spider is coupled to the coil former
to support the voice coil in the air gap. The spider has convolutions
radially outward from the coil former. The convolutions include arcs and
generally straight sections. A surround is coupled to the outer perimeter
and the frame to support the outer perimeter from the frame. The surround
has convolutions radially outward from the outer perimeter. The
convolutions include arcs and generally straight sections. The generally
straight sections may have non-uniform lengths and non-uniformly varying
lengths with increasing distance from the coil former. The arcs may have
non-uniform radii of curvature and non-uniformly varying radii of
curvature with increasing distance from the coil former. The arcs may have
non-uniform lengths and non-uniformly varying lengths with increasing
distance from the coil former.