Dayton Audio DMA70-4
4Ω
8ΩFull-range
2.5″ / 64 mm
Nominal diameter
113 Hz
Resonance
0.44
Q factor
83 dB
Sensitivity
± 2 mm
Linear excursion
40 W
Program Power
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Parts Express
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
83.0
dB
Frequency response
110 - 20000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
113
Hz
Mechanical quality factor
QMS
2.04
Electrical quality factor
QES
0.56
Total quality factor
QTS
0.44
Large signal parameters
Maximum linear excursion
xmax
2.0
mm
Air volume displaced at xmax
VD
4.6
cm³
Power handling
P
20
W
Program power
Pmax
40
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
4.0
Ω
Inductance (1kHz)
LE
0.3
mH
VC Diameter
25
mm
Magnet
Force factor
Bl
3.7
N/A
Motor constant
Bl/√RE
1.85
N/√W
Diaphragm
Effective diameter
54
mm
Effective area
SD
23
cm²
Moving mass
MMS
2.8
g
Moving mass (without air load)
MMD
2.7
g
Suspensions
Stiffness
KMS
1.41
N/mm
Compliance
CMS
710
µm/N
Equivalent volume to the compliance
VAS
0.566
L
Mechanical resistance
RMS
0.97
N·s/m
Dimensions
Nominal diameter
2.5
″
64
mm
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2.5″Full-range
fS
114 Hz
SD
23 cm²
110 - 20000 Hz
QTS
0.50
xmax
2.0 mm
SPL1W
83 dB
Bl/√RE
1.72
Pmax
40 W
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2.5″Full-range
fS
109 Hz
SD
17 cm²
200 - 20000 Hz
QTS
0.51
xmax
4.3 mm
SPL1W
82 dB
Bl/√RE
1.46
Pmax
12 W
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3″Mid-range
fS
90 Hz
SD
32 cm²
90 - 20000 Hz
QTS
0.35
xmax
1.0 mm
SPL1W
85 dB
Bl/√RE
2.4
Pmax
30 W