4″ / 102 mm
Nominal diameter
87 Hz
Resonance
0.77
Q factor
85 dB
Sensitivity
± 0.7 mm
Linear excursion
40 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
Sensitivity (1w, 1m, infinite baffle)
SPL1W
84.7
dB
Frequency response
20 - 12000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
86.8
Hz
Mechanical quality factor
QMS
3.47
Electrical quality factor
QES
0.99
Total quality factor
QTS
0.77
Large signal parameters
Maximum linear excursion
xmax
0.7
mm
Air volume displaced at xmax
VD
4.8
cm³
Power handling
P
20
W
Program power
Pmax
40
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
7.6
Ω
Inductance (1kHz)
LE
0.04
mH
VC Diameter
32
mm
Magnet
Force factor
Bl
5.9
N/A
Motor constant
Bl/√RE
2.14
N/√W
Air gap height
HAG
4
mm
Diaphragm
Effective diameter
93
mm
Effective area
SD
68
cm²
Moving mass
MMS
8.3
g
Moving mass (without air load)
MMD
7.9
g
Suspensions
Stiffness
KMS
2.47
N/mm
Compliance
CMS
404
µm/N
Equivalent volume to the compliance
VAS
2.62
L
Mechanical resistance
RMS
1.3
N·s/m
Dimensions
Nominal diameter
4
″
102
mm
Volume occupied by the driver (estimated)
0.14
L
Net weight
0.22
kg
Similar speaker drivers to Peerless BMR85DD NA8Y
4″Full-range
fS
80 Hz
SD
55 cm²
80 - 10000 Hz
QTS
0.70
xmax
2.0 mm
SPL1W
84 dB
Bl/√RE
1.7
Pmax
16 W
4″Full-range
fS
85 Hz
SD
53 cm²
80 - 15000 Hz
QTS
0.64
xmax
2.0 mm
SPL1W
85 dB
Bl/√RE
1.58
Pmax
80 W
4″Mid-range
fS
75 Hz
SD
57 cm²
75 - 18000 Hz
QTS
0.67
xmax
1.0 mm
SPL1W
85 dB
Bl/√RE
1.53
Pmax
50 W