Linear parameters – Dayton Audio PS180-8 6-1 User Manual

Page 7

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.

Linear Parameters

Symbol

Large + Warm Large + Cold Small Signal Unit

Comment

Note:

for accurate small signal parameters, use LPM module

Delta Tv = Tv-Ta 14

increase of voice coil temperature during the measurement

Xprot

6.6

4.0

maximal voice coil excursion (limited by protection system)

Re (Tv)

6.67

6.32

Ohm (imported) voice coil resistance considering increase of voice coil

temperature Tv

Le (X=0)

0.11

voice coil inductance at the rest position of the voice coil

L2 (X=0)

0.75

0.32

para-inductance at the rest position due to the effect of eddy current

R2 (X=0)

0.24

0.39

Ohm resistance at the rest position due to eddy currents

Cmes (X=0)

135

155

µF

electrical capacitance representing moving mass

Lces (X=0)

114.03

70.33

electrical inductance at the rest position representing driver compliance

Res (X=0)

467.09

82.23

Ohm resistance at the rest position due to mechanical losses

Qms (X=0, Tv)

16.06

3.86

mechanical Q-factor considering Rms only

Qes (Tv)

0.21

0.20

0.24

electrical Q-factor considering Re (Tv) only

Qts (X=0, Tv)

0.21

0.20

0.23

total Q-factor considering Re (Tv) and Rms only

40.6

48.2

driver resonance frequency

Mms

7.180

(imported) mechanical mass of driver diaphragm assembly including voice-

coil and air load

Rms (X=0)

0.114

0.564

kg/s

mechanical resistance of total-driver losses

Cms (X=0)

2.14

1.52

mm/N mechanical compliance of driver suspension at the rest position

Bl (X=0)

7.56

N/A

(imported) force factor at the rest position (Bl product)

Vas

57.0714

40.4097

equivalent air volume of suspension

1.710

1.806

reference efficiency (2Pi-sr radiation using Re)