ScanSpeak 18W, 8542-10 MidWoofer - Classic Range
7" 8-ohm MidWoofer, High output, 42mm voice coil, highly regarded and used in many OEM and DIY speakers.
Air-dried Paper/Carbon Fibre cone, Scanspeak Symmetrical Motor Design, and a low-damping Coated Foam surround.
Specification
Resonance frequency [fs] 43 Hz
Mechanical Q factor [Qms] 1.7
Electrical Q factor [Qes] 0.44
Total Q factor [Qts] 0.35
Force factor [Bl] 6.9 Tm Mechanical resistance [Rms] 2.1 kg/s
Moving mass [Mms] 13.6 g
Compliance [Cms] 1.0 mm/N Effective diaph. diameter [D] 131 mm
Effective piston area [Sd] 135 cm2
Equivalent volume [Vas] 26 l
Sensitivity (2.83V/1m) 88 dB Ratio Bl/√Re 2.9 N/√W Ratio fs/Qts 123 Hz
Electrical Data
Nominal impedance [Zn] 8 Ω
Minimum impedance [Zmin] 6.6 Ω
Maximum impedance [Zo] 27 Ω
DC resistance [Re] 5.7 Ω
Voice coil inductance [Le] 0.2 mH
Power Handling
100h RMS noise test (IEC 17.1) 70W
Long-term max power (IEC 17.3) 130W
Voice Coil & 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 2.2 kg
PRICE (1 off)
£154.08 +vat +p&p