Hertz HMX 6.5

2 Way

6.5″ / 165 mm
Nominal diameter
65 Hz
Resonance
0.7
Q factor
88 dB
Sensitivity
± 3.65 mm
Linear excursion
150 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
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Specifications

Sensitivity (1W, 1m, infinite baffle)
SPL1W
87.5
dB
Frequency response
50 - 25000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
65.0
Hz
Mechanical quality factor
QMS
11.50
Electrical quality factor
QES
0.75
Total quality factor
QTS
0.70

Large signal parameters

Maximum linear excursion
xmax
3.65
mm
Air volume displaced at xmax
VD
45
cm³
Power handling
P
75
W
Program power
Pmax
150
W

Voice Coil

Nominal impedance
Z
4
Ω
DC resistance
RE
3.5
Ω
Inductance (1kHz)
LE
0.53
mH
VC Diameter
25
mm

Magnet

Force factor
Bl
5.2
N/A
Motor constant
Bl/√RE
2.78
N/√W
Material
High density flux ferrite

Diaphragm

Effective diameter
125
mm
Effective area
SD
125
cm²
Moving mass
MMS
14
g
Moving mass (without air load)
MMD
12.9
g
Material
Polypropylene with UV inhibitors

Suspensions

Stiffness
KMS
2.5
N/mm
Compliance
CMS
400
µm/N
Equivalent volume to the compliance
VAS
8.8
L
Mechanical resistance
RMS
0.5
N·s/m

Dimensions

Nominal diameter
6.5
165
mm
Volume occupied by the driver (estimated)
0.5
L
Hertz HMX 6.5 SPL & Impedance

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