Eighteen Sound 6M44
Mid-range
6.5″ / 162 mm
Nominal diameter
102 Hz
Resonance
0.29
Q factor
93 dB
Sensitivity
± 2.25 mm
Linear excursion
350 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
92.9
dB
Frequency response
140 - 7000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
102
Hz
Mechanical quality factor
QMS
4.40
Electrical quality factor
QES
0.31
Total quality factor
QTS
0.29
Large signal parameters
Maximum linear excursion
xmax
2.25
mm
Air volume displaced at xmax
VD
30
cm³
Power handling
P
200
W
Program power
Pmax
350
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.3
Ω
Inductance (1kHz)
LE
0.32
mH
VC Diameter
44
mm
Winding height
HVC
8
mm
Winding material
Aluminum
Magnet
Force factor
Bl
13.4
N/A
Motor constant
Bl/√RE
5.82
N/√W
Air gap height
HAG
7
mm
Material
Ferrite
Diaphragm
Effective diameter
130
mm
Effective area
SD
132
cm²
Moving mass
MMS
16
g
Moving mass (without air load)
MMD
14.9
g
Material
Weather protected
Suspensions
Stiffness
KMS
6.58
N/mm
Compliance
CMS
152
µm/N
Equivalent volume to the compliance
VAS
3.8
L
Mechanical resistance
RMS
2.33
N·s/m
Dimensions
Nominal diameter
6.5
″
162
mm
Overall diameter
162
mm
Baffle cutout diameter
148
mm
Overall depth
85
mm
Flange thickness
13
mm
Mounting depth
72
mm
Volume occupied by the driver (estimated)
0.87
L
Net weight
3.4
kg
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6.5″Mid-range
fS
102 Hz
SD
129 cm²
100 - 4000 Hz
QTS
0.29
xmax
3.9 mm
SPL1W
93 dB
Bl/√RE
5.37
Pmax
500 W
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5″Mid-range
fS
100 Hz
SD
102 cm²
300 - 5000 Hz
QTS
0.27
xmax
3.1 mm
SPL1W
94 dB
Bl/√RE
4.47
Pmax
200 W
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5″Mid-range
fS
90 Hz
SD
85 cm²
100 - 6500 Hz
QTS
0.31
xmax
5.1 mm
SPL1W
91 dB
Bl/√RE
3.89
Pmax
240 W