
N.C. Madsensvej 1 · 6920 Videbæk · Denmark · Phone: +45 6040 5200 · www.scan-speak.dk
MIDWOOFER 18W/8545K00
The Symmetric Drive (SD-1) concept with copper in the magnet system was invented
by Scan-Speak. High-quality magnet system design has thus been a key feature of
Scan-Speak design since the companys inception. The Classic woofers are highly
praised, and are used in some of the worlds most exceptional high-end Loudspeakers.
Some feature Kevlar cones others have the innovative Carbon fibre paper cones.
KEY FEATURES:
· Patented Symmetrical Drive Motor Design
· Air Dried Paper/Carbon Fibre Cone
· 42mm Voice Coil w. fiber glass foil
· Low-Loss linear suspension
· Low Damping SBR Rubber Surround
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] 5.20
Electrical Q factor [Qes] 0.30
Total Q factor [Qts] 0.28
Force factor [Bl] 8.2 Tm
Mechanical resistance [Rms] 0.69 kg/s
Moving mass [Mms] 20.5 g
Suspension compliance [Cms] 1.58 mm/N
Effective diaph. diameter [D] 136 mm
Effective piston area [Sd] 145 cm²
Equivalent volume [Vas] 46.4 l
Sensitivity (2.83V/1m) 87.5 dB
Ratio Bl/√Re 3.50 N/√W
Ratio fs/Qts 99 Hz
Electrical Data
Nominal impedance [Zn] 8 Ω
Minimum impedance [Zmin] 6.6 Ω
Maximum impedance [Zo] 101 Ω
DC resistance [Re] 5.5 Ω
Voice coil inductance [Le] 0.4 mH
Power Handling
100h RMS noise test (IEC 17.1) 100 W
Long-term max power (IEC 17.3) - W
Voice Coil and Magnet Data
Voice coil diameter 42 mm
Voice coil height 19 mm
Voice coil layers 2
Height of gap 6 mm
Linear excursion ± 6.5 mm
Max mech. excursion ± 10 mm
Unit weight 2.3 kg