<p>The MW 8BMW-D subwoofers are not only the ideal upgrade for those who are dissatisfied with the bass response in their BMW, but particularly for those who want to realize unprecedented space saving installation concepts.<br><br>The BMW-specific baskets and Plug &amp; Play connectors allow a fast and easy installation into the original mounting positions of all BMW model ranges with under-seat subwoofers.<br><br>Nevertheless, these subwoofers are also perfectly qualified for universal applications. Thanks to the very low mounting depth, extremely compact sealed enclosures are no problem at all whereas the oversized 1.7” / 42.5 mm voice coil assures high power handling. Furthermore, the special speaker connector with its gold-plated screw terminals allows two different configurations and therefore flexible connection options. With the ex works installed connection bracket the subwoofer has an impedance of 1 x 4 Ohms, otherwise each voice coil can be driven individually (impedance 2 x 2 Ohms) and allows perfect combination with MATCH Plug &amp; Play amplifiers.<br><br>No matter if these subwoofers are used as bass upgrade in your BMW or as problem-solver in small sub enclosures, they will definitely add loads of powerful bass for musical enjoyment.<br><br>This speaker is suitable to use in BMW Top HiFi ( Harman/Kardon, Logic7, Hifi System Professional DSP etc ) systems with codes S688A/S677A/S752A thanks to 4 Ohm load. You can get 4 Ohm load by connecting voice coils in series.<br><br>1-series E81 3-door 2004 – 2011 Under-seat<br>E82 Coupe 2004 – 2011 Under-seat<br>E87 5-door 2004 – 2011 Under-seat<br>E88 Convertible 2004 – 2011 Under-seat<br>F20 5-door 2011 – Under-seat<br>F21 3-door 2011 – Under-seat<br><br>2-series F22 Coupe 2011 – Under-seat<br>F23 Convertible 2011 – Under-seat<br><br>3-series E90 Sedan 2005 – 2011 Under-seat<br>E91 Touring 2005 – 2011 Under-seat<br>E92 Coupe 2005 – 2011 Under-seat<br>E93 Convertible 2005 – 2011 Under-seat<br>F30 Sedan 2012 – Under-seat<br>F31 Touring 2012 – Under-seat<br>F34 Gran Turismo 2013 – Under-seat<br>F35 Sedan Long Version 2012 – Under-seat<br><br>4-series F32 Coupe 2014 – Under-seat<br>F33 Convertible 2014 -<br><br>5-series E60 Sedan 2003 – 2010 Under-seat<br>E61 Touring 2003 – 2010 Under-seat<br>F10 Sedan 2011 – Under-seat<br>F11 Touring 2011 – Under-seat<br><br>6-series F12 Convertible 2011 – Under-seat<br>F13 Coupe 2011 – Under-seat<br><br>7-series F01 Sedan 2008 – Under-seat<br><br>X1 E84 SUV 2009 – 2012 Under-seat<br><br>X3 E83 SUV 2003 – 2010 Under-seat<br>F25 SUV 2010 – Under-seat<br><br>X4 F26 SUV 2014 – Under-seat<br><br>X5 E70 SUV 2006 – 2013 Under-seat<br><br>X6 E71 SUV 2008 – Under-seat</p>

TECHNICAL DATA

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.