A preferably elongated loudspeaker (LS), which preferably comprises a
cylindrical moving coil (SP) and an elongated diaphragm (M) with an
elongated fastening part (B) and an annular retaining part (H) lying
within the fastening part (B), and with corrugations (S1) extending in
radial directions, wherein the diaphragm (M) comprises an arrangement for
reducing its stiffness in at least one narrow region (SM1, SM2), which
arrangement is present between the fastening part (B) and the retaining
part (H). In a preferred embodiment comprising an arrangement of the
corrugations (S1) in the at least one narrow region (SM1, SM2) the
corrugation density is smaller than the corrugation density in at least
one wide region (BM1, BM2). Preferably, the diaphragm (M) furthermore
comprises an additional corrugation (S2) in the at least one narrow
region (SM1, SM2), which additional corrugation (S2) extends transversely
to radial directions. The above measures serve to reduce the stiffness of
the diaphragm (M) locally so as to minimize disadvantageous mechanical
forces exerted by the diaphragm (M) on the moving coil (SP).