Welcome to CEN Automotive. Order by 2PM weekdays for Same Day Dispatch. Match UP W8BMW-D 4ohm BMW 1, 2, 3, 4, 5 X Series 8 Inch Underseat Subwoofers. MATCH UP W8BMW-D 4ohm. Approved compatibility with BMW Models. Premium cars deserve premium sound – the basic speaker setup in BMW vehicles does not meet the expectations of ambitious music lovers in many cases. 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 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. Fits directly into the original mounting positions under the front seats of all BMW model ranges with under-seat subwoofers. Also ideal for universal use in ultra-flat subwoofer constructions. 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. Impedance Z 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 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 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. Suitable for all BMW model ranges with under-seat subwoofers and universal use. 2 x Subwoofer MATCH MW 8BMW-D. 2 x Plug connector for original BMW cable harness. 1 x Instruction manual.