Hertz Mille MPS 250 S4

Subwoofer

10″ / 250 mm
Nominal diameter
29 Hz
Resonance
0.48
Q factor
83 dB
Sensitivity
± 16.8 mm
Linear excursion
1000 W
Program Power
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
Discard
Apply
Sensitivity (1W, 1m, infinite baffle)
SPL1W
83.4
dB
Frequency response
25 - 400
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
29.0
Hz
Mechanical quality factor
QMS
5.60
Electrical quality factor
QES
0.52
Total quality factor
QTS
0.48

Large signal parameters

Maximum linear excursion
xmax
16.8
mm
Maximum excursion before damage
xlim
20.0
mm
Air volume displaced at xmax
VD
619
cm³
Power handling
P
500
W
Program power
Pmax
1000
W

Voice Coil

Nominal impedance
Z
4
Ω
DC resistance
RE
3.3
Ω
Inductance (1kHz)
LE
3.65
mH
VC Diameter
38
mm

Magnet

Force factor
Bl
17.3
N/A
Motor constant
Bl/√RE
9.52
N/√W
Diameter
134
mm
Height
36
mm
Material
Ferrite

Diaphragm

Effective diameter
217
mm
Effective area
SD
369
cm²
Moving mass
MMS
234
g
Moving mass (without air load)
MMD
228.7
g
Material
Polypropylene

Suspensions

Stiffness
KMS
9.09
N/mm
Compliance
CMS
110
µm/N
Equivalent volume to the compliance
VAS
21.2
L
Mechanical resistance
RMS
7.61
N·s/m

Dimensions

Nominal diameter
10
250
mm
Overall diameter
275
mm
Baffle cutout diameter
232
mm
Overall depth
103
mm
Flange thickness
20
mm
Mounting depth
83
mm
Volume occupied by the driver (estimated)
1.8
L
Net weight
5.11
kg
Hertz MPS 250 S4 Impedance

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