Wavecor MR120BD01

Mid-range

4.75″ / 120 mm
Nominal diameter
70 Hz
Resonance
0.44
Q factor
86 dB
Sensitivity
± 1.5 mm
Linear excursion
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
Discard
Apply
Sensitivity (1W, 1m, infinite baffle)
SPL1W
85.6
dB
Frequency response
200 - 4000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
70.0
Hz
Mechanical quality factor
QMS
8.40
Electrical quality factor
QES
0.47
Total quality factor
QTS
0.44

Large signal parameters

Maximum linear excursion
xmax
1.5
mm
Air volume displaced at xmax
VD
7.5
cm³

Voice Coil

Nominal impedance
Z
4
Ω
DC resistance
RE
3.2
Ω
Inductance (1kHz, estimated)
LE
0.13
mH
VC Diameter
25
mm
Winding height
HVC
7
mm
Former material
Black fiber glass

Magnet

Force factor
Bl
4.2
N/A
Motor constant
Bl/√RE
2.35
N/√W
Air gap height
HAG
4
mm
Diameter
90
mm
Weight
0.44
kg

Diaphragm

Effective diameter
80
mm
Effective area
SD
50
cm²
Moving mass
MMS
5.7
g
Moving mass (without air load)
MMD
5.4
g
Material
Kevlar/Carbon fiber

Suspensions

Stiffness
KMS
1.11
N/mm
Compliance
CMS
900
µm/N
Equivalent volume to the compliance
VAS
3.2
L
Mechanical resistance
RMS
0.3
N·s/m

Dimensions

Nominal diameter
4.75
120
mm
Overall diameter
120
mm
Baffle cutout diameter
98
mm
Mounting depth
64
mm
Volume occupied by the driver (estimated)
0.44
L
Net weight
1.1
kg
Frame material
Die cast aluminum
Wavecor MR120BD01 Impedance
Wavecor MR120BD01 SPL
Wavecor MR120BD01 Dimensions

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