Dayton Audio ND140-8

Mid Bass

5.25″ / 138 mm
Nominal diameter
57 Hz
Resonance
0.68
Q factor
85 dB
Sensitivity
± 4 mm
Linear excursion
80 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
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Specifications

Sensitivity (1W, 1m, infinite baffle)
SPL1W
84.7
dB
Frequency response
54 - 8000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
56.5
Hz
Mechanical quality factor
QMS
5.01
Electrical quality factor
QES
0.79
Total quality factor
QTS
0.68

Large signal parameters

Maximum linear excursion
xmax
4.0
mm
Air volume displaced at xmax
VD
35
cm³
Power handling
P
40
W
Program power
Pmax
80
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
7.8
Ω
Inductance (1kHz)
LE
1.44
mH
VC Diameter
25
mm
Winding material
Copper
Former material
Kapton® / Polyimide

Magnet

Force factor
Bl
6.05
N/A
Motor constant
Bl/√RE
2.17
N/√W
Material
Neodymium

Diaphragm

Effective diameter
105
mm
Effective area
SD
87
cm²
Moving mass
MMS
10.4
g
Moving mass (without air load)
MMD
9.8
g
Material
Black Anodized Aluminum

Suspensions

Stiffness
KMS
1.32
N/mm
Compliance
CMS
760
µm/N
Equivalent volume to the compliance
VAS
7.74
L
Mechanical resistance
RMS
0.74
N·s/m
Surround material
Rubber

Dimensions

Nominal diameter
5.25
138
mm
Overall diameter
138
mm
Baffle cutout diameter
120
mm
Overall depth
71
mm
Volume occupied by the driver (estimated)
0.32
L
Frame material
Steel
Dayton Audio ND140-8 Impedance
Dayton Audio ND140-8 SPL
Dayton Audio ND140-8 Dimensions

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