About the Focal IFBMW-SUB
How low?

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
- MFR # IFBMW-SUB
What's in the box:
Focal IFBMW-SUB 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
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More details on the Focal IFBMW-SUB

Features & specs
General | ||
---|---|---|
Speaker Size | ||
Design | 1-way | |
Tweeter Design | --- | |
Impedance (Ohms) | 3.6 | |
Tweeter Composition | --- | |
Woofer Composition | Polypropylene | |
Woofer Surround | Butyl Rubber | |
Parts Warranty | 1 Year | |
Labor Warranty | 1 Year | |
Specifications | ||
Sensitivity (1W at 1 meter) | N/A | |
Sensitivity at 2.83 volts | 90.5 | |
Frequency Response | 38 - 0.2k Hz | |
Minimum RMS Wattage | 30 | |
Maximum RMS Wattage | 90 | |
Peak Power Handling (Watts) | 180 | |
Top-mount Depth (Inches) | 1 11/16 | |
Bottom-mount Depth (Inches) | N/A | |
Cutout Diameter or Length (inches) | 7 15/16 | |
Mounting Height (Inches) | 0.526 |
Product Research
Features
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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