8″ / 222 mm
Nominal diameter
34 Hz
Resonance
0.63
Q factor
81 dB
Sensitivity
± 13.5 mm
Linear excursion
500 W
Program Power
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
81.3
dB
Thiele & Small parameters
Resonance frequency (free air)
fS
34.4
Hz
Mechanical quality factor
QMS
7.20
Electrical quality factor
QES
0.70
Total quality factor
QTS
0.63
Large signal parameters
Maximum linear excursion
xmax
13.5
mm
Air volume displaced at xmax
VD
270
cm³
Power handling
P
250
W
Program power
Pmax
500
W
Voice Coil
Nominal impedance
Z
2 x 2
Ω
DC resistance (in series)
RE
4.0
Ω
Inductance (1kHz, in series, estimated)
LE
0.81
mH
Magnet
Force factor (in series)
Bl
9.9
N/A
Motor constant
Bl/√RE
4.95
N/√W
Diameter
118
mm
Diaphragm
Effective diameter
160
mm
Effective area
SD
200
cm²
Moving mass
MMS
81.7
g
Moving mass (without air load)
MMD
79.5
g
Suspensions
Stiffness
KMS
3.82
N/mm
Compliance
CMS
262
µm/N
Equivalent volume to the compliance
VAS
14.9
L
Mechanical resistance
RMS
2.45
N·s/m
Dimensions
Nominal diameter
8
″
222
mm
Overall diameter
222
mm
Baffle cutout diameter
180
mm
Mounting depth
112
mm
Volume occupied by the driver (estimated)
1.1
L
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Dayton Audio UM8-222 x 2 Ω
8″Subwoofer
fS
34 Hz
SD
211 cm²
30 - 800 Hz
QTS
0.64
xmax
16.0 mm
SPL1W
81 dB
Bl/√RE
4.49
Pmax
600 W