N.C. Madsensvej 1 6920 Videbæk Denmark Phone: +45 6040 5200 www.scan-speak.dk
MIDWOOFER
18WU/8741T00
The Illuminator midranges and midwoofers are in every aspect unusual designs with
the open construction, the extremely long linear excursion and patented under-hung
SD-3 (Symmetrical Drive) neodymium motor system, which due to copper caps and its
construction ensures very low distortion, adding the unique patented cones, low-loss
linear suspension the result is: “The Very Best Money Can Buy”!
KEY FEATURES:
Under-Hung Neodymium Motor Design
Patented Sandwich Paper Cone
Low-Loss linear suspension
Patented Symmetrical Drive (SD-3)
Exceptionally Long Linear Excursion
Patented Design
Notes:
IEC specs. refer to IEC 60268-5 third edition.
All Scan-Speak products are RoHS compliant.
Data are subject to change without notice.
Datasheet updated: February 22, 2011.
T-S Parameters
Resonance frequency [fs]
31 Hz
Mechanical Q factor [Qms]
3.51
Electrical Q factor [Qes]
0.37
Total Q factor [Qts]
0.33
Force factor [Bl]
7.5 Tm
Mechanical resistance [Rms]
1.00 kg/s
Moving mass [Mms]
18 g
Suspension compliance [Cms]
1.46 mm/N
Effective diaph. diameter [D]
140 mm
Effective piston area [Sd]
154 cm²
Equivalent volume [Vas]
48.6 l
Sensitivity (2.83V/1m)
85.4 dB
Ratio Bl/√Re
3.09 N/√W
Ratio fs/Qts
93 Hz
Electrical Data
Nominal impedance [Zn]
8 Ω
Minimum impedance [Zmin]
7.5 Ω
Maximum impedance [Zo]
61.9 Ω
DC resistance [Re]
5.9 Ω
Voice coil inductance [Le]
0.41 mH
Power Handling
100h RMS noise test (IEC 17.1)
80 W
Long-term max power (IEC 17.3)
150 W
Voice Coil and Magnet Data
Voice coil diameter
42 mm
Voice coil height
8 mm
Voice coil layers
4
Height of gap
20 mm
Linear excursion
± 9 mm
Max mech. excursion
± 16 mm
Unit weight
1.7 kg
