Dayton Audio CE70PR-4
Full-range
2.5″ / 70 mm
Nominal diameter
109 Hz
Resonance
0.63
Q factor
82 dB
Sensitivity
± 4 mm
Linear excursion
40 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
81.5
dB
Frequency response
85 - 13000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
109
Hz
Mechanical quality factor
QMS
3.50
Electrical quality factor
QES
0.77
Total quality factor
QTS
0.63
Large signal parameters
Maximum linear excursion
xmax
4.0
mm
Air volume displaced at xmax
VD
9.8
cm³
Power handling
P
20
W
Program power
Pmax
40
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
3.1
Ω
Inductance (1kHz)
LE
0.31
mH
VC Diameter
20
mm
Magnet
Force factor
Bl
3.11
N/A
Motor constant
Bl/√RE
1.76
N/√W
Diaphragm
Effective diameter
56
mm
Effective area
SD
25
cm²
Moving mass
MMS
3.5
g
Moving mass (without air load)
MMD
3.4
g
Suspensions
Stiffness
KMS
1.64
N/mm
Compliance
CMS
610
µm/N
Equivalent volume to the compliance
VAS
0.523
L
Mechanical resistance
RMS
0.68
N·s/m
Dimensions
Nominal diameter
2.5
″
70
mm
Overall diameter
70
mm
Baffle cutout diameter
64
mm
Overall depth
41
mm
Volume occupied by the driver (estimated)
0.1
L
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2.5″Full-range
fS
109 Hz
SD
21 cm²
110 - 17000 Hz
QTS
0.64
xmax
2.0 mm
SPL1W
82 dB
Bl/√RE
1.27
Pmax
40 W
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2.5″Full-range
fS
115 Hz
SD
20 cm²
QTS
0.68
xmax
2.7 mm
SPL1W
81 dB
Bl/√RE
1.53
Pmax
40 W
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2.5″Woofer
fS
94 Hz
SD
22 cm²
80 - 5000 Hz
QTS
0.55
xmax
4.3 mm
SPL1W
81 dB
Bl/√RE
1.84
Pmax
20 W