ATOHM LD180CR04
Mid Bass
8″ / 180 mm
Nominal diameter
46 Hz
Resonance
0.32
Q factor
90 dB
Sensitivity
± 7.5 mm
Linear excursion
300 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
89.5
dB
Thiele & Small parameters
Resonance frequency (free air)
fS
46.0
Hz
Mechanical quality factor
QMS
3.94
Electrical quality factor
QES
0.35
Total quality factor
QTS
0.32
Large signal parameters
Maximum linear excursion
xmax
7.5
mm
Maximum excursion before damage
xlim
11.0
mm
Air volume displaced at xmax
VD
120
cm³
Power handling
P
150
W
Program power
Pmax
300
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
3.6
Ω
Inductance (1kHz)
LE
0.58
mH
VC Diameter
35
mm
Winding height
HVC
18
mm
Magnet
Flux density
B
1.12
T
Force factor
Bl
7.2
N/A
Motor constant
Bl/√RE
3.79
N/√W
Air gap height
HAG
6
mm
Diaphragm
Effective diameter
143
mm
Effective area
SD
160
cm²
Moving mass
MMS
18.2
g
Moving mass (without air load)
MMD
16.7
g
Suspensions
Stiffness
KMS
1.52
N/mm
Compliance
CMS
660
µm/N
Equivalent volume to the compliance
VAS
24.3
L
Mechanical resistance
RMS
1.34
N·s/m
Dimensions
Nominal diameter
8
″
180
mm
Volume occupied by the driver (estimated)
0.62
L
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fS
42 Hz
SD
228 cm²
50 - 6300 Hz
QTS
0.34
xmax
7.3 mm
SPL1W
89 dB
Bl/√RE
5.65
Pmax
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fS
44 Hz
SD
137 cm²
44 - 4500 Hz
QTS
0.32
xmax
3.0 mm
SPL1W
89 dB
Bl/√RE
3.11
Pmax
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