
N.C. Madsensvej 1 · 6920 Videbæk · Denmark · Phone: +45 6040 5200 · www.scan-speak.dk
MIDWOOFER 18W/8531G00
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-2) it represented a breakthrough
in midrange clarity and overall smooth frequency response characteristics.
KEY FEATURES:
· Patented Symmetrical Drive Motor Design
· Low-Loss linear suspension
· Die cast Alu Chassis vented below spider
· Sliced Cone (Controls Cone Breakups)
· Low Damping SBR Rubber Surround
· 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: February 22, 2011.
T-S Parameters
Resonance frequency [fs] 28 Hz
Mechanical Q factor [Qms] 5.10
Electrical Q factor [Qes] 0.39
Total Q factor [Qts] 0.36
Force factor [Bl] 6.8 Tm
Mechanical resistance [Rms] 0.60 kg/s
Moving mass [Mms] 17.5 g
Suspension compliance [Cms] 1.85 mm/N
Effective diaph. diameter [D] 138 mm
Effective piston area [Sd] 150 cm²
Equivalent volume [Vas] 58.2 l
Sensitivity (2.83V/1m) 87 dB
Ratio Bl/√Re 2.82 N/√W
Ratio fs/Qts 77 Hz
Electrical Data
Nominal impedance [Zn] 8 Ω
Minimum impedance [Zmin] 6.4 Ω
Maximum impedance [Zo] 81.6 Ω
DC resistance [Re] 5.8 Ω
Voice coil inductance [Le] 0.35 mH
Power Handling
100h RMS noise test (IEC 17.1) 60 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