DMA is able to analyze the real effects of power and excursion upon the magnetic circuit of the motor, specifically the dynamic variations of the "fixed" magnetic field. This delivers intensely valuable information compared to traditional modeling, which assumes that the "fixed" field produced in the air gap by the magnet and the motor plates is unchanging. The reality is that this "fixed" field changes in reaction to the magnetic field created by current flowing through the voice coil. Analyzing this behavior is critical to understanding the distortion mechanisms of a speaker motor. Ignoring the dynamic nature of the "fixed" field, prevents specifically addressing the aspects of motor design that determine truly linear behavior, which are as follows:

 

1) Linear motor force over the speaker's operational excursion range

2) Consistent motor force with both positive and negative current through the coil

3) Consistent motor force at varying applied power levels

Our ability to fully analyze these aspects of motor behavior allows our transducer engineers to make critical adjustments to motor designs that result in extremely linear, highly stable dynamic loudspeaker motor systems.

 

The payoff is reduced distortion, improved transient performance and stellar sound quality.