Objectives: This study is aimed at the quantitative investigation of skull bone surface wave propagation dependence on different coupling methods of the bone conduction hearing aid (BCHA). Design: Experiments were conducted on five Thiel embalmed whole head cadaver specimens. The electromagnetic actuators from a commercial BCHA (Baha® Cordelle and Power) were used to provide stepped sine stimulus in the range of 0.1-10 kHz. Osseous pathways were sequentially activated by a BCHA mounted on a 5-Newton steel headband on Mastoid, on a percutaneously implanted screw (Baha® Connect), and transcutaneously with a Baha® Attract at bone anchored hearing aid (BAHA) location. Surface motion was quantified by sequentially measuring ~200 points on the skull surface via a three-dimensional laser Doppler vibrometer (3D LDV) system. Results: The stimulation area undergoes deformations at a lower frequency range than the whole head does (less than 500Hz versus more than 1 kHz). Stiffer coupling (Connect versus Headband) appears to lead to earlier onset and faster transition, with frequency, to local deformations and wave motion. Conclusion: For stimulation with the headband at the mastoid, the sound wave travelling across the head does not exactly origin from the site of stimulation. Potentially, because the skull vibration is influenced by the dynamic mechanical properties of skull plates.