Dayton Audio ND91-8

Full-range

3.5″ / 104 mm
Nominal diameter
71 Hz
Resonance
0.47
Q factor
82 dB
Sensitivity
± 5.1 mm
Linear excursion
60 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
81.6
dB
Frequency response
70 - 17000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
70.7
Hz
Mechanical quality factor
QMS
4.29
Electrical quality factor
QES
0.53
Total quality factor
QTS
0.47

Large signal parameters

Maximum linear excursion
xmax
5.1
mm
Air volume displaced at xmax
VD
16
cm³
Power handling
P
30
W
Program power
Pmax
60
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
7.8
Ω
Inductance (1kHz)
LE
1.24
mH
VC Diameter
25
mm
Winding material
Aluminum
Former material
Kapton® / Polyimide

Magnet

Force factor
Bl
5.63
N/A
Motor constant
Bl/√RE
2.02
N/√W
Material
Ferrite

Diaphragm

Effective diameter
62
mm
Effective area
SD
30
cm²
Moving mass
MMS
4.8
g
Moving mass (without air load)
MMD
4.7
g
Material
Aluminum

Suspensions

Stiffness
KMS
0.95
N/mm
Compliance
CMS
1050
µm/N
Equivalent volume to the compliance
VAS
1.53
L
Mechanical resistance
RMS
0.5
N·s/m
Surround material
Rubber

Dimensions

Nominal diameter
3.5
104
mm
Overall diameter
104
mm
Baffle cutout diameter
85
mm
Overall depth
56
mm
Volume occupied by the driver (estimated)
0.16
L
Frame material
Steel
Dayton Audio ND91-8 Impedance
Dayton Audio ND91-8 SPL
Dayton Audio ND91-8 Dimensions

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