Nonlinear parameters – Dayton Audio PS180-8 6-1 User Manual
Page 2
Nonlinear Parameters
The electrodynamic coupling factor, also called Bl-product or force factor Bl(x), is defined by the integral of the magnetic flux
density B over voice coil length l, and translates current into force. In traditional modeling this parameter is assumed to be
constant. The force factor Bl(0) at the rest position corresponds with the Bl-product used in linear modeling. The red curve
displays Bl over the entire displacement range covered during the measurement. You see the typical decay of Bl when the
voice coil moves out of the gap.At the end of the measurement, the black curve shows the confidential range (interval where
the voice coil displacement in this range occurred 99% of the measurement time). During the measurement, the black curve
shows the current working range. The dashed curve displays Bl(x) mirrored at the rest position of the voice coil – this
way, asymmetries can be quickly identified. Since a laser was connected during the measurement, a "coil in / coil out" marker
is displayed on the bottom left / bottom right.
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