Klippel R&D System
KCS-ID Manual
11
For identifying the voice coil rest position, KCS evaluates the nonlinear distortion found in the
measured current signal caused by the nonlinear Bl(x) speaker characteristic. If the Bl(x) curve is too
linear, not enough distortion is created to perform an identification of the rest position. In this case
also an active shifting of the voice coil position using a DC voltage (
Stabilization
) is not possible.
Note that KCS will work anyway, but higher safety margins for the maximum allowed excursion are
required, leading to less acoustical output at low frequencies.
For KCS it is highly recommended to use a speaker with a higher decay of the Bl(x) curve (usually a
decay to 50…75% relative to Bl(x=0). The higher Bl(x) decay leads to higher efficiency and sensitivity
and the added nonlinear distortion caused by the more nonlinear Bl(x) is compensated by KCS. In
addition, the KCS stabilization allows to exploit the working range of the speaker optimally.
