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
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
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
Eighteen Sound 6M44 Impedance
Eighteen Sound 6M44 SPL
Eighteen Sound 6M44 Dimensions

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