MATCH MW 8BMW-D 400W 8 200mm Under-Seat Shallow Subwoofer System for BMW Vehicles. 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. The BMW-specific baskets and Plug & Play connectors allow a fast and easy installation into the original mounting positions of all BMW model ranges with under-seat subwoofers. Nevertheless, these subwoofers are also perfectly qualified for universal applications. Furthermore, the special speaker connector with its gold-plated screw terminals allows two different configurations. If the metal bracket is mounted the woofer has an impedance of 1 x 4 Ohms – without the metal bracket each voice coil can be driven separately (in this case 2 x 2 Ohms) which is perfect for the combination with MATCH Plug & Play amplifiers. 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. 8 / 200 mm subwoofers with very low mounting depth for shallow subwoofer designs and under-seat installation in BMW vehicles. Allows to use extremely compact, sealed enclosures. 2 x 2 Ohms impedance per woofer for most flexible connection options. Fit directly into the original mounting positions under the front seats of all BMW model ranges with under-seat subwoofers. Also, well suited for universal use in shallow subwoofer designs. The speaker connector with its gold-plated screw terminals allows two different configurations. If the metal bracket is mounted the woofer has an impedance of 1 x 4 Ohms. Without the metal bracket each voice coil can be driven separately (impedance in this case 2 x 2 Ohms) which guarantees a perfect interaction with MATCH Plug & Play amplifiers. Power RMS / max. P 200 / 400 Watts. 2 x 2? DC resistance Re 3.4? 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 BI 8.6 Tm. Efficiency 1 W / 1 m. 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 12.5 mm. 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. Net volume 3 L. Lower limiting frequency (-3dB) 63 Hz. High pass: Butterworth; 12 dB/octave; crossover frequency 40 Hz. Additional EQ filter: centre frequency 90 Hz; Q factor 3.0; gain -4 dB. Lowpass: Butterworth; 24 dB/octave; crossover frequency 80 – 100 Hz. 60 mm / 2.36. 80 mm / 3.15. 25 cm / 9.84. 20 cm / 3.94. Port tuning frequency Fb. Lower limiting frequency (-3dB) 45 Hz. High pass: Self-Define; crossover frequency 40 Hz; Q factor 1.3. Additional EQ filter: centre frequency 67 Hz; Q factor 3.0; gain -3 dB. Suitable for all BMW model ranges with under-seat subwoofers. Included in the box. 2 x Subwoofer MATCH MW 8BMW-D. 2 x Plug connector for original BMW cable harness. 1 x Instruction manual.