Eighteen Sound 6NMB420

16Ω

Mid Bass

6.5″ / 152 mm
Nominal diameter
110 Hz
Resonance
0.33
Q factor
96 dB
Sensitivity
± 3 mm
Linear excursion
260 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
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Specifications

Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.8
dB
Frequency response
200 - 7000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
110
Hz
Mechanical quality factor
QMS
2.70
Electrical quality factor
QES
0.38
Total quality factor
QTS
0.33

Large signal parameters

Maximum linear excursion
xmax
3.0
mm
Air volume displaced at xmax
VD
39
cm³
Power handling
P
200
W
Program power
Pmax
260
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.3
Ω
Inductance (1kHz)
LE
0.1
mH
VC Diameter
44
mm
Winding material
Aluminum

Magnet

Force factor
Bl
9.0
N/A
Motor constant
Bl/√RE
3.91
N/√W
Material
Neodymium

Diaphragm

Effective diameter
129
mm
Effective area
SD
130
cm²
Moving mass
MMS
8.5
g
Moving mass (without air load)
MMD
7.4
g
Material
Weather protected

Suspensions

Stiffness
KMS
4.07
N/mm
Compliance
CMS
246
µm/N
Equivalent volume to the compliance
VAS
6.1
L
Mechanical resistance
RMS
2.18
N·s/m

Dimensions

Nominal diameter
6.5
152
mm
Overall diameter
162
mm
Baffle cutout diameter
148
mm
Overall depth
73
mm
Flange thickness
11
mm
Mounting depth
62
mm
Volume occupied by the driver (estimated)
0.41
L
Net weight
1.25
kg
Eighteen Sound 6NMB420 Impedance
Eighteen Sound 6NMB420 SPL
Eighteen Sound 6NMB420 Dimensions

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