W 100 S 4 OHM Art. No. 9020 10 cm (4") HiFi low-midrange driver with coated paper cone, elastic rubber surround and 20 mm voice-coil. Suitable as woofer in mini-speaker systems and due to the very balanced frequency response especially suitable as low-midrange driver in 3-way speakers and in subwoofer/satellite systems. Recommended cabinets: Volume/Principle BR-Channel fb fc/QTC 4 l/closed  -  - 100 Hz/0,7 5 l/bass reflex BR 6.8 (length 6 cm) 70 Hz  - 10 l/bass reflex BR 6.8 (length 5 cm) 56 Hz  -   Used in / Accessories: ALTO III C ALTO GENESIS SAT
sketch frequency- and impedance response	Technical Data: Rated power 30 W Maximum power 50 W Nominal impedance Z 4 Ohm Frequency response fu–15000 Hz (fu: Lower cut-off frequency depending on cabinet) . Mean sound pressure level 86 dB (1 W/1 m) Opening angle (-6 dB) 86°/4000 Hz Excursion limit +/−4 mm Resonance frequency fs 66 Hz Magnetic induction 1 T Magnetic flux 250 µWb Height of front pole-plate 4 mm Voice coil diameter 20 mm Height of winding 8 mm Cutout diameter 94 mm Net weight 0,49 kg D.C. resistance Rdc 3,3 Ohm Mechanical Q factor Qms 2,45 Electrical Q factor Qes 0,61 Total Q factor Qts 0,49 Equivalent volume Vas 5,5 l Effective piston area Sd 53 cm² Dynamically moved mass Mms 4,2 g Force factor Bxl 3,1 Tm Inductance of the voice coil L 0,5 mH Similar Products TI 100 8 OHM W 100 S 8 OHM
directivity pattern