Dayton Audio ND65-8
4Ω
8Ω
Full-range
2.5″ / 64 mm
Nominal diameter
77 Hz
Resonance
0.41
Q factor
80 dB
Sensitivity
± 3.5 mm
Linear excursion
30 W
Program Power
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
79.5
dB
Frequency response
80 - 20000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
77.4
Hz
Mechanical quality factor
QMS
4.01
Electrical quality factor
QES
0.46
Total quality factor
QTS
0.41
Large signal parameters
Maximum linear excursion
xmax
3.5
mm
Air volume displaced at xmax
VD
5.5
cm³
Power handling
P
15
W
Program power
Pmax
30
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
7.4
Ω
Inductance (1kHz)
LE
1.04
mH
VC Diameter
19
mm
Winding material
Copper
Former material
Kapton® / Polyimide
Magnet
Force factor
Bl
4.47
N/A
Motor constant
Bl/√RE
1.64
N/√W
Material
Neodymium
Diaphragm
Effective diameter
45
mm
Effective area
SD
16
cm²
Moving mass
MMS
2.5
g
Moving mass (without air load)
MMD
2.5
g
Material
Black Anodized Aluminum
Suspensions
Stiffness
KMS
0.6
N/mm
Compliance
CMS
1680
µm/N
Equivalent volume to the compliance
VAS
0.71
L
Mechanical resistance
RMS
0.3
N·s/m
Surround material
Rubber
Dimensions
Nominal diameter
2.5
″
64
mm
Overall diameter
64
mm
Baffle cutout diameter
52
mm
Overall depth
48
mm
Volume occupied by the driver (estimated)
0.15
L
Frame material
Steel
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3″Full-range
fS
70 Hz
SD
24 cm²
100 - 20000 Hz
QTS
0.37
xmax
4.6 mm
SPL1W
82 dB
Bl/√RE
1.76
Pmax
12 W