8" underseat subwoofer for select BMW vehicles

Item #: 091IFBMWSB

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How low?

Your BMW is a great car. Wouldn't you like for the bass response of your car's stereo system to be great, too? The path to solid bass is easier than you think, thanks to the folks at Focal.

Here's how

Focal designed their IFBMW-SUB 8" flat subwoofer to replace the original 6-1/2" underseat sub in select BMW 1, 3, and X1 Series vehicles without modification to the car, giving you the bass power you need. This sub will work great with your BMW's factory system, but its reinforced polypropylene cone and butyl rubber surround can handle up to 90 watts RMS, so it'll thrive with aftermarket amplification. The included steel-and-mesh grille provides protection for the speaker in its new home.

Here's why

Now you can add an extra dimension to your sophisticated vehicle, and let your hair down just a little. Install one of these subs under each seat, and your system will deliver some serious punch. And thanks to Focal's design smarts, nobody will even know you've got the stealthiest upgrade around until you play the car stereo for them. Wouldn't you like to feel the bass as part of your car's internal space?

Product Highlights:

  • single 8" flat subwoofer
  • fits select BMW 1, 3, and X1 Series vehicles
  • fits original factory mounts and wiring without modification
  • reinforced polypropylene cone with butyl rubber surround
  • impedance: 3.6 ohms
  • power handling: 90 watts RMS (180 watts peak power)
  • sensitivity: 90.5 dB
  • frequency response: 38-200 Hz
  • warranty: 1 year
  • Our 60-day money-back guarantee

Why replace your car's original speakers?

The speakers that originally came in your car were made from inexpensive materials, designed to create acceptable sound at the lowest possible cost to the manufacturer. If you love music, you deserve better. Name-brand aftermarket speakers deliver fuller, richer sound with considerably more detail and nuance, and they're capable of playing louder and cleaner than factory speakers. Connect new speakers to your factory radio and you'll get the best possible sound from your dealer-equipped system. Pair them up with a new car stereo for a level of enjoyment that can rival a high-fidelity home audio experience.

Hands-on research

What's in the box?

Download owner's manual

  • 1 Subwoofer
  • 1 Grille
  • Four 3/4" Allen head screws (3mm head)
  • Installation instructions (English/ French)
  • Serial number card
  • Specs listed on box

Product Research


Mounting: The IFBMW-SUB fits as a direct replacement for the factory under-seat subwoofers in select BMW 1 Series, 3 Series, and X1 models. IFBMW-SUBs are packaged individually, so you will need to purchase two.

Wiring: The BMW factory wiring harness plugs directly into the IFBMW-SUB frame.

Our Product Research Team

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