The head tracker in the Quantum ONE uses your movements to calibrate the sensors. You can speed up the calibration process by doing the following: * Imagine that the headphone is a standard cube with 6 faces (Front, Back, Left, Right, Top, Bottom) * Orient the headphone so that it is sitting on each face of "the cube" sequentially. For example, start with the headphone positioned normally (bottom face of the cube down). Then rotate it so that the right side of the cube is facing down. Then continue through the rest of the faces of the cube. * Hold the headphone in each position for 1 second * Once all the faces of the device have been rotated, set the headphone down on a stationary surface for 2 or 3 seconds.