Transducer Parameters
Transducer Parameters
Small Signal Lumped Parameters
- Resonance frequency fs
Mechanical quality factor Qms
Electrical quality factor Qes
DC resistance Re
Force factor Bl(x=0)
Mechanical resistance Rms(v=0)
Stiffness Kms(x=0) and compliance Cms(x=0)
Additional Thiele-Small parameters (e.g. Vas)
Visco-elastic parameter (creep factor λ)
Lossy inductance parameters (Wright, Leach, LR2 model)
Transducer Nonlinearities (Curve Shape)
- Force factor Bl(x) versus displacement x
Mechanical compliance Cms(x) versus displacement x
Mechanical stiffness Kms(x) versus displacement x
Incremental stiffness Kinc(x) versus displacement x
Inductance L(x,i) versus displacement x and current i
Mechanical resistance Rms(v) versus velocity v
Force-deflection curve F(x)
Single-valued Nonlinear Parameters
- Voice coil offset Xoffset
Suspension asymmetry Ak
Maximal peak displacement Xmax
Force factor limited peak displacement Xbi
Suspension limited peak displacement Xc
Inductance limited peak displacement XL
Stiffness Kms(x=0) at the voice rest position
Force factor Bl(x=0) at the voice coil rest position
Effective stiffness related to effective resonance frequency
Symmetry point xsym in force factor curve
Electrical Impedance
- Amplitude and phase response
Nominal electrical impedance Zn
Impedance measured by using a large signal model
Parameters of the Enclosure
- Port resonance fb
Quality factor Qlb of vented enclosure