
N.C. Madsensvej 1 · 6920 Videbæk · Denmark · Phone: +45 6040 5200 · www.scan-speak.dk
MIDWOOFER 18W/4531G01
The Revelator midrange and midwoofers, both well known for their sliced paper cone
technology. The slices are filled with damping glue, which dramatically reduces break-
up modes in the diaphragm. In combination with Scan-Speaks low-loss linear
suspension and the patented Symmetrical Drive (SD-1) it represented a breakthrough
in midrange clarity and overall smooth frequency response characteristics.
KEY FEATURES:
· Patented Symmetrical Drive Motor Design
· Wood Fibre Cone
· Low Damping SBR Rubber Surround
· Sliced Cone (Controls Cone Breakups)
· Low-Loss linear suspension
· Large Ferrite Magnet System
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: March 11, 2011.
T-S Parameters
Resonance frequency [fs] 34 Hz
Mechanical Q factor [Qms] 4.90
Electrical Q factor [Qes] 0.38
Total Q factor [Qts] 0.35
Force factor [Bl] 5.7 Tm
Mechanical resistance [Rms] 0.74 kg/s
Moving mass [Mms] 16.9 g
Suspension compliance [Cms] 1.3 mm/N
Effective diaph. diameter [D] 142 mm
Effective piston area [Sd] 157 cm²
Equivalent volume [Vas] 45.6 l
Sensitivity (2.83V/1m) 89 dB
Ratio Bl/√Re 3.05 N/√W
Ratio fs/Qts 97 Hz
Electrical Data
Nominal impedance [Zn] 4 Ω
Minimum impedance [Zmin] 4.4 Ω
Maximum impedance [Zo] 40.0 Ω
DC resistance [Re] 3.5 Ω
Voice coil inductance [Le] 0.27 mH
Power Handling
100h RMS noise test (IEC 17.1) 70 W
Long-term max power (IEC 17.3) - W
Voice Coil and Magnet Data
Voice coil diameter 38 mm
Voice coil height 18 mm
Voice coil layers 2
Height of gap 5 mm
Linear excursion ± 6.5 mm
Max mech. excursion ± 11 mm
Unit weight 1.7 kg