8" underseat subwoofer for select BMW vehicles

  • Focal IFBMW-SUB


  • Focal IFBMW-SUB


  • Focal IFBMW-SUB

  • Focal IFBMW-SUB

  • Focal IFBMW-SUB

  • Focal IFBMW-SUB

Item #: 091IFBMWSB
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Your price $399.99 Each
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Our take on the Focal IFBMW-SUB

by Bob Bihlmayer

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.

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?

See more info on this item


  • 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

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Speaker Size
Tweeter Design
Tweeter Composition
Woofer Composition
Woofer Surround
Butyl Rubber
Parts Warranty
1 Year
Labor Warranty
1 Year
90.5 dB at 2.83 volts
Frequency Response
38 - 0.2k Hz
RMS Power Range (Watts)
Peak Power Handling (Watts)
Impedance (Ohms)
Top-mount Depth (Inches)
1 11/16
Bottom-mount Depth (Inches)
Cutout Diameter or Length (inches)
7 15/16
Product 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

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.


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.

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