MIDWOOFER 18WU/4741T00 - Scan-Speak

MIDWOOFER18WU/4741T00The Illuminator midranges and midwoofers are in every aspect unusual designs withthe open construction, the extremely long linear excursion and patented under-hungSD-3 (Symmetrical Drive) neodymium motor system, which due to copper caps and itsconstruction ensures very low distortion, adding the unique patented cones, low-losslinear 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 DesignT-S ParametersResonance frequency [fs]30 HzMechanical Q factor [Qms] 3.56Electrical Q factor [Qes] 0.32Total Q factor [Qts] 0.29Force factor [Bl]Mechanical resistance [Rms]Moving mass [Mms]Suspension compliance [Cms]Effective diaph. diameter [D]Effective piston area [Sd]Equivalent volume [Vas]Sensitivity (2.83V/1m)Ratio Bl/√ReRatio fs/Qts6 Tm1.00 kg/s18.9 g1.49 mm/N140 mm154 cm²49.4 l87.2 dB3.35 N/√W102 HzNotes: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.Electrical DataNominal impedance [Zn]4 ΩMinimum impedance [Zmin]4.5 ΩMaximum impedance [Zo]38.8 ΩDC resistance [Re]3.2 ΩVoice coil inductance [Le]0.5 mHPower Handling100h RMS noise test (IEC 17.1)80 WLong-term max power (IEC 17.3) 150 WVoice Coil and Magnet DataVoice coil diameter42 mmVoice coil height8 mmVoice coil layers 4Height of gap20 mmLinear excursion± 9 mmMax mech. excursion± 16 mmUnit weight1.7 kgN.C. Madsensvej 1 6920 Videbæk Denmark Phone: +45 6040 5200 www.scan-speak.dk

MIDWOOFER18WU/4741T00Advanced Parameters (Preliminary)Electrical data:Mechanical DataResistance [Re']3.41 ΩForce Factor [Bl]5.20 TmFree inductance [Leb]0.0517 mHMoving mass [Mms]17.1 gBound inductance [Le]2.59 mHCompliance [Cms]0.963 mm/NSemi-inductance [Ke]0.0641 SHMechanical resistance [Rms]0.178 kg/sShunt resistance [Rss]4.53 ΩAdmittance [Ams]0.140 mm/NN.C. Madsensvej 1 6920 Videbæk Denmark Phone: +45 6040 5200 www.scan-speak.dk