Abstract: Disclosed herein are embodiments of a bone anchored hearing aid device unit having a housing and an actuator having a first plate piezo element and a first counterweight. The unit further includes a clamp system configured for attaching the actuator or part of the actuator to the housing. The clamp system clamps the first plate piezo element of the actuator at a first clamp position at the first plate piezo element and at a second clamp position at the first plate piezo element, and in that the first counterweight is positioned between the first clamp position and the second clamp position.

Abstract: Embodiments of the present disclosure generally relates to a coupling for coupling an external hearing device with an abutment of a bone anchored hearing system. The disclosure more particularly relates to a coupling for coupling an external hearing device with an abutment of a bone anchored hearing system, the coupling including: at least two coupling arms for establishing a connection to the abutment of the bone anchored hearing system. The disclosure further relates to a coupling assembly for coupling an external hearing device with an abutment of a bone anchored hearing system and a bone anchored hearing system.