Adjustable vibration absorber which is suitable for wind turbines, essentially consisting of an absorber weight and at least one double-cone bearing for adaptation and adjustment to excitation frequencies occurring in the turbine, where the at least one double-cone bearing comprises two cone bearings which are arranged with their broad cone base and/or their short cone base opposite one another, and each of the two cone bearings comprises: (a) at least one rotationally symmetrical non-elastic inner cone element and (b) at least one rotationally symmetrical non-elastic outer cone element, which has been pushed over the inner cone element, where inner cone element and outer cone element are connected to one another by a single- or multilayered elastomer layer and each have a cylindrical hole centrally in the axial direction for accommodation of attachment or tensioning devices, and the inner cone element and/or the outer cone element can be displaced actively or passively in the axial direction by mechanical, hydraulic, pneumatic or magnetic pressure means or devices in the cone bearing or outside the cone bearing, characterised in that a rotationally symmetrical free space, which is present in the untensioned state and is shaped corresponding to the said cone elements, is provided in the region of the elastomer layer along the interface between elastomer layer and inner cone element or along the interface between elastomer layer and outer cone element on the side facing the outer cone element or on the side facing the inner cone element and which (i) is formed by bulging, concave or convex shaping of the elastomer layer and/or of the non-elastic inner or outer cone element in this region, (ii) has a length along the said interface which corresponds to 20 to 80% of the length of the cone elements or the length of the elastomer layer between the said cone elements, and (iii) has a thickness along the said interface which corresponds to 5 - 30% of the thickness of the elastomer layer between the said cone elements, where the said free space is partly or completely filled by the axial active or passive displacement of the said non-elastic cone elements by means of said mechanical, hydraulic, pneumatic or magnetic pressure means or devices by compression and partial displacement of the said elastomer layer present between the conical elements into the said free space, enabling the stiffness of the cone bearing to be varied and adapted in accordance with the excitation frequency to be damped. (a) at least one rotationally symmetrical non-elastic inner cone element and (b) at least one rotationally symmetrical non-elastic outer cone element, which has been pushed over the inner cone element, (i) is formed by bulging, concave or convex shaping of the elastomer layer and/or of the non-elastic inner or outer cone element in this region, (ii) has a length along the said interface which corresponds to 20 to 80% of the length of the cone elements or the length of the elastomer layer between the said cone elements, and (iii) has a thickness along the said interface which corresponds to 5 - 30% of the thickness of the elastomer layer between the said cone elements,