Scan-Speak 18W/8545-01

Mid Bass

8″ / 180 mm
Nominal diameter
25 Hz
Resonance
0.2
Q factor
88 dB
Sensitivity
± 6.5 mm
Linear excursion
120 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
88.1
dB
Frequency response
25 - 3000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
25.0
Hz
Mechanical quality factor
QMS
1.55
Electrical quality factor
QES
0.22
Total quality factor
QTS
0.20

Large signal parameters

Maximum linear excursion
xmax
6.5
mm
Maximum excursion before damage
xlim
10.0
mm
Air volume displaced at xmax
VD
94
cm³
Power handling
P
100
W
Program power
Pmax
120
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.7
Ω
Inductance (1kHz, estimated)
LE
0.45
mH
VC Diameter
42
mm
Winding height
HVC
19
mm
Former material
Aluminium

Magnet

Force factor
Bl
8.4
N/A
Motor constant
Bl/√RE
3.52
N/√W
Air gap height
HAG
6
mm

Diaphragm

Effective diameter
136
mm
Effective area
SD
145
cm²
Moving mass
MMS
18
g
Moving mass (without air load)
MMD
16.7
g
Material
Coated Paper/Carbon Fibre

Suspensions

Stiffness
KMS
0.44
N/mm
Compliance
CMS
2300
µm/N
Equivalent volume to the compliance
VAS
68.6
L
Mechanical resistance
RMS
1.8
N·s/m
Surround material
SBR Rubber

Dimensions

Nominal diameter
8
180
mm
Volume occupied by the driver
0.54
L
Net weight
2.3
kg
Frame material
Aluminium
Scan-Speak 18W/8545-01 SPL & Impedance
Scan-Speak 18W/8545-01 Dimensions

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VOLT BM165.1 Mid Bass
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fS
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SD
154 cm²
50 - 3000 Hz
QTS
0.24
xmax
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SPL1W
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Bl/√RE
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Pmax
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