Dayton Audio ND90-8 3-1 - Manual (Page 7)

Parameters at the Rest Position
The value of the nonlinear parameters at the rest position (x=0) may be used as input for the traditional
linear modelling and may be referred as “linear parameters”. Please note that these parameters
depend on the instantaneous state of the driver (voice coil temperature, peak value of displacement)
and are presented for three different modes of operation:
Linear Parameters
C3 0.00063392 1/Nmm^2 3rd order coefficient in compliance expansion
C4 1.5212e-006 1/Nmm^3 4th order coefficient in compliance expansion
C5 1/Nmm^4 5th order coefficient in compliance expansion
C6 1/Nmm^5 6th order coefficient in compliance expansion
C7 1/Nmm^6 7th order coefficient in compliance expansion
C8 1/Nmm^7 8th order coefficient in compliance expansion
K0 = Kms (X=0) N/mm constant part in stiffness
K1 -0.0098365 N/mm^2 1st order coefficient in stiffness expansion
K2 0.0027793 N/mm^3 2nd order coefficient in stiffness expansion
K3 0.00043221 N/mm^4 3rd order coefficient in stiffness expansion
K4 7.9507e-005 N/mm^5 4th order coefficient in stiffness expansion
Xpse 8.8 mm -Xpse < X < Xpse, range where power series is fitted
Mode Properties
LARGE+WARM the transducer is operated in the large signal domain, the peak value of the
displacement is high (|x| < xmax), the variation of the parameters is not
negligible, the voice coil temperature is increased (D TV > 0) due to heating.
LARGE+COLD the transducer is operated in the large signal domain, the peak value of the
displacement is high (|x| < xmax), the variation of the parameters is not
negligible, the effect of heating is compensated while considering the cold voice
coil resistance Re(D TV =0).
SMALL SIGNAL the transducer is operated in the small signal domain, the amplitude of the
excitation signal is sufficiently small, the displacement is small in comparison to
the allowed maximal displacement (|x| << xmax ), the variations of the nonlinear
parameters are negligible, the increase of voice coil temperature is negligible (D
TV » 0), the effects of the nonlinear, thermal and time-varying mechanisms are
negligible, the transducer behaves almost linear.
Symbol
Large +
Warm
Large +
Cold
Small
Signal
Unit Comment
Note:
for accurate small signal parameters, use LPM
module
Delta Tv =
39 0 0 K
increase of voice coil temperature during the