Power RMS / max. P 200 / 400 Watts Impedance Z 2 x 2 Ω DC resistance Re 3.4 Ω Resonance frequency Fs 46 Hz Mechanical Q factor Qms 4.45 Electrical Q factor Qes 0.59 Total Q factor Qts 0.52 Compliance Cms 272 µm/N Equivalent air volume Vas 17.3 L Force factor B*I 8.6 Tm Efficiency 1 W / 1 m SPL 90 dB Cone area Sd 214 cm² Moving mass Mms 44.2 g Cone material Hand-scooped paper cone Mechanical resistance Rms 0.74 kg/s Voice coil diameter ø 42.5 mm Voice coil winding height Handgeschöpfte Papiermembran Max. linear excursion Xmax +/- 4.0 mm Outer diameter ø 239 mm / 9.41″ Installation diameter ø 175 mm / 6.89″ Installation depth 40 mm / 1.57″ Recommended enclosure volumes Sealed box Net volume 3 L Lower limiting frequency (-3dB) 63 Hz DSP settings – Highpass: Butterworth 12 dB/octave crossover frequency 40 Hz – Additional EQ filter: center frequency 90 Hz Q factor 3.0 gain -4 dB – Lowpass: Butterworth 24 dB/octave crossover frequency 80 – 100 Hz Vented box For one subwoofer For two subwoofers Net volume 12 L 24 L Port diameter ø 60 mm / 2.36″ 80 mm / 3.15 Port area 28 cm² 50 cm² Port length 25 cm / 9.84″ 20 cm / 3.94″ Port tuning frequency Fb 46 Hz 46 Hz Lower limiting frequency (-3dB) 45 Hz 45 Hz DSP settings – Highpass: Self-Define crossover frequency 40 Hz Q factor 1.3 – Additional EQ filter: center frequency 67 Hz Q factor 3.0 gain -3 dB – Lowpass: Butterworth 24 dB/octave crossover frequency 80 – 100 Hz Compatibility: 1-series E81 3-door 2004 – 2011 Under-seat E82 Coupe 2004 – 2011 Under-seat E87 5-door 2004 – 2011 Under-seat E88 Convertible 2004 – 2011 Under-seat F20 5-door 2011 – Under-seat F21 3-door 2011 – Under-seat 2-series F22 Coupe 2011 – Under-seat F23 Convertible 2011 – Under-seat 3-series E90 Sedan 2005 – 2011 Under-seat E91 Touring 2005 – 2011 Under-seat E92 Coupe 2005 – 2011 Under-seat E93 Convertible 2005 – 2011 Under-seat F30 Sedan 2012 – Under-seat F31 Touring 2012 – Under-seat F34 Gran Turismo 2013 – Under-seat F35 Sedan Long Version 2012 – Under-seat 4-series F32 Coupe 2014 – Under-seat F33 Convertible 2014 – 5-series E60 Sedan 2003 – 2010 Under-seat E61 Touring 2003 – 2010 Under-seat F10 Sedan 2011 – Under-seat F11 Touring 2011 – Under-seat 6-series F12 Convertible 2011 – Under-seat F13 Coupe 2011 – Under-seat 7-series F01 Sedan 2008 – Under-seat X1 E84 SUV 2009 – 2012 Under-seat X3 E83 SUV 2003 – 2010 Under-seat F25 SUV 2010 – Under-seat X4 F26 SUV 2014 – Under-seat X5 E70 SUV 2006 – 2013 Under-seat X6 E71 SUV 2008 – Under-seat.