Dynaudio Esotar2 110, Manual

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33μF
4.7Ω
Esotec MW 172 Woofer
Esotec MW 172
The new Esotec MW 172 is a 20 cm (8 inch) diameter mid/woofer
designed for high performance two-and three way systems.
The MW 172 will perform extremely well in a wide range of enclosures, either
sealed, vented, or free-air. The MW 172 exhibits a unique combination of
smooth frequency response, low distortion, and extremely powerful bass to
deliver an outstanding sonic performance in any high performance two- or
three-way system.
The MW 172 utilizes an oversized 75 mm (3 inch) diameter voice coil to drive
the MSP one-piece cone diaphragm. The new 15, 17 and 20 cm Esotec
car series woofers all utilize new ultra compressed dual ferrite magnets
positioned inside the coil to produce maximum utilization of the magnetic
energy. The powerful double magnet system utilizes a vented pole piece
for additional cooling. Positioning the magnet structure inside the voice coil
enables the use of a very large voice coil, which in turn produces increased
power and efficiency and yields a linear movement of the cone without cone
breakup. Phase response is smooth and uniform. The large diameter of the
voice coils provides optimum drive of the diaphragm and guarantees enough
headroom with regard to power rating, while assuring perfect control of even
the most minute membrane displacement. The use of a large diameter voice
coil also allows for the flat Dynaudio MSP cone membrane geometry, which
results in minimal phase lag at crossover to midrange driver.
The MW 172 is a perfectly balanced driver with excellent dispersion, a linear
frequency response and an extraordinary absence of resonance, rendering
it ideal for anchoring even a high quality two-way system even with its rela-
tively large cone diameter.
Thiele Small Parameters
Nominal impedance Znom 4 Ω
DC resistance Re 3.2 Ω
Voice coil inductance Le 0.27 mH
Resonance frequency fs 45 Hz
Mechanical Q factor Qms 2.3
Electrical Q factor Qes 0.65
Total Q factor Qts 0.51
Mechanical resistance Rms 2.6 kg/s
Moving mass (incl. air load) Mms 21.4 g
Suspension compliance Cms 0.58 mm/N
Effective dome diameter d 151 mm
Effective piston area Sd 180 cm²
Equivalent volume Vas 27 l
Force factor BL 5.4 Tm
Recommended frequency range 35–3500 Hz
Magnet and Voice Coil Properties
Voice coil diameter dc 75 mm
Voice coil height hc 14 mm
Linear excursion, peak to peak 9 mm
Max. excursion, peak to peak 15 mm
Power Handling
Nominal long term IEC 150 W
Transient (10 ms) 1000 W
Mechanical Properties
Net weight 1.6 kg
Overall dimension ø 200 x 88 mm
SPL
Red line: on-axis response
Green line: 30° horizontal
Blue line: 60° horizontal
Measurement conditions:
Level: 2.83 V
Distance: 1 m
Box volume: 18 l
Facts
Diaphragm and dust cap moulded
as one piece
Very large 75 mm voice coil
ensures high power handling
Internal double magnet system
with vented pole piece
Aluminium voice coil wire provides
for a low moving mass
Rigid die-cast chassis with
aerodynamically shaped ribs
Materials and parameters are
optimized for the harsh environ-
mental conditions in a car
Natural midrange reproduction
Smooth high-frequency roll-off
Impedance
(with and without impedance
correction circuit)
Red line: impedance, free air
Green line: impedance, free air
with compensation.
Measurement conditions:
Level: 2 V, 10 ohm
Driver in free air
Impedance compensation circuit