
N.C. Madsensvej 1 · 6920 Videbæk · Denmark · Phone: +45 6040 5200 · www.scan-speak.dk
MIDWOOFER 18W/4424G00
The Discovery series offer traditional design, superior sound, a solid construction, and
a wide range of variants. Combining these elements - plus a wealth of technical
features and finesses - it gives our customers the possibility of acquiring a tailor-made
Scan-Speak solution with very good performance at a reasonable low price point!
KEY FEATURES:
· High Output 91dB @ 2,83V
· Coated NRSC Fibre Glass Cone
· Die cast Alu Chassis vented below spider
· Excellent Midrange Performance
· 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] 49 Hz
Mechanical Q factor [Qms] 4.57
Electrical Q factor [Qes] 0.42
Total Q factor [Qts] 0.38
Force factor [Bl] 5.2 Tm
Mechanical resistance [Rms] 0.77 kg/s
Moving mass [Mms] 11.4 g
Suspension compliance [Cms] 0.92 mm/N
Effective diaph. diameter [D] 132 mm
Effective piston area [Sd] 137 cm²
Equivalent volume [Vas] 24.1 l
Sensitivity (2.83V/1m) 90.9 dB
Ratio Bl/√Re 2.91 N/√W
Ratio fs/Qts 128 Hz
Electrical Data
Nominal impedance [Zn] 4 Ω
Minimum impedance [Zmin] 4.1 Ω
Maximum impedance [Zo] 38.0 Ω
DC resistance [Re] 3.2 Ω
Voice coil inductance [Le] 0.47 mH
Power Handling
100h RMS noise test (IEC 17.1) 50 W
Long-term max power (IEC 17.3) 110 W
Voice Coil and Magnet Data
Voice coil diameter 25 mm
Voice coil height 10.5 mm
Voice coil layers 2
Height of gap 5 mm
Linear excursion ± 2.8 mm
Max mech. excursion ± 8 mm
Unit weight 1.1 kg