Focal UTOPIA M 8 WM

Woofer

8″ / 203 mm
Nominal diameter
49 Hz
Resonance
0.9
Q factor
88 dB
Sensitivity
± 5.5 mm
Linear excursion
200 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
87.9
dB
Frequency response
45 - 50000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
49.0
Hz
Mechanical quality factor
QMS
9.00
Electrical quality factor
QES
1.00
Total quality factor
QTS
0.90

Large signal parameters

Maximum linear excursion
xmax
5.5
mm
Air volume displaced at xmax
VD
119
cm³
Power handling
P
100
W
Program power
Pmax
200
W

Voice Coil

Nominal impedance
Z
4
Ω
DC resistance
RE
2.7
Ω
Inductance (1kHz, estimated)
LE
0.25
mH
VC Diameter
80
mm
Winding material
Copper Clad Aluminium
Former material
Glass Fiber

Magnet

Force factor
Bl
4.4
N/A
Motor constant
Bl/√RE
2.68
N/√W
Diameter
75
mm
Height
4
mm

Diaphragm

Effective diameter
166
mm
Effective area
SD
216
cm²
Moving mass
MMS
23
g
Moving mass (without air load)
MMD
20.7
g
Material
M-shape W

Suspensions

Stiffness
KMS
2.22
N/mm
Compliance
CMS
450
µm/N
Equivalent volume to the compliance
VAS
30
L
Mechanical resistance
RMS
0.79
N·s/m
Surround material
Butyl

Dimensions

Nominal diameter
8
203
mm
Baffle cutout diameter
185
mm
Mounting depth
52
mm
Volume occupied by the driver (estimated)
0.48
L
Net weight
1.2
kg
Focal 8 WM SPL & Impedance
Focal 8 WM Dimensions

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