Dayton Audio PS220-8 8" Point Source Full-Range Neo Driver - Manual (Page 6)

Linear Parameters
Symbol
Large +
Warm
Large +
Cold
Small
Signal
Unit Comment
Note:
for accurate small signal parameters, use
LPM module
Delta Tv =
Tv-Ta
18 0 0 K
increase of voice coil temperature during the
measurement
Xprot 7.3 7.3 4.9 mm maximal voice coil excursion (limited by
protection system)
Re (Tv) 6.39 5.97 5.97 Ohm (imported) voice coil resistance considering
increase of voice coil temperature Tv
Le (X=0) 0.16 0.16 0.16 mH
voice coil inductance at the rest position of
the voice coil
L2 (X=0) 0.70 0.70 0.39 mH
para-inductance at the rest position due to the
effect of eddy current
R2 (X=0) 0.45 0.45 0.61 Ohm resistance at the rest position due to eddy
currents
Cmes
(X=0)
214 214 247 µF
electrical capacitance representing moving
mass
Lces (X=0) 92.04 92.04 49.53 mH
electrical inductance at the rest position
representing driver compliance
Res (X=0) 195.99 195.99 51.18 Ohm resistance at the rest position due to
mechanical losses
For accurate system modelling “Large + Cold” parameters are preferable to “Small Signal”
parameters because they more closely reflect the parameters in their typical operating range.
Qms (X=0,
Tv)
9.44 9.44 3.61 mechanical Q-factor considering Rms only
Qes (Tv) 0.27 0.26 0.32 electrical Q-factor considering Re (Tv) only
Qts (X=0,
Tv)
0.27 0.25 0.30
total Q-factor considering Re (Tv) and Rms
only
fs 35.9 35.9 45.5 Hz driver resonance frequency
Mms 10.600 10.600 10.600 g
(imported) mechanical mass of driver
diaphragm assembly including voice-coil and
air load
Rms (X=0) 0.253 0.253 0.839 kg/s mechanical resistance of total-driver losses
Cms (X=0) 1.86 1.86 1.15 mm/N mechanical compliance of driver suspension
at the rest position
Bl (X=0) 7.47 7.47 7.47 N/A (imported) force factor at the rest position (Bl
product)
Vas 127.0133 127.0133 78.9623 l equivalent air volume of suspension
N0 2.057 2.200 2.200 %
reference efficiency (2Pi-sr radiation using
Re)
Lm 95.3 95.6 95.6 dB characteristic sound pressure level
Sd
220.35 220.35 220.35 cm² diaphragm area