Focal ISUB BMW 8 Inside Series Direct Fit Sub Under Seat Subwoofer 8ohm
Couldn't Load Pickup availability
The Focal ISUB BMW 8 is an 8 inch (200mm), 8 ohm direct-fit under-seat replacement subwoofer for BMW and MINI vehicles with factory Harman Kardon audio systems, part of Focal's Inside Series range.
This is the 8 ohm version. Other impedances are available: ISUB BMW 2 (2 ohm), ISUB BMW 4 (4 ohm, single) and ISUB BMW 4 pair.
Key specifications
- Type: 8 inch (200mm) under-seat subwoofer, single
- Impedance: 8 ohms
- Power handling: 90W RMS (180W max)
- Sensitivity: 83dB (2.83V/1m)
- Cone: Polyglass with butyl surround
- Magnet: neodymium
- Fit: BMW and MINI with Harman Kardon audio
ISUB BMW 8 subwoofer, 8 ohm Harman Kardon replacement
A direct-fit replacement subwoofer for BMW and MINI vehicles with Harman Kardon audio systems, built to Focal's Inside Series standard. Its neodymium motor delivers powerful, accurate bass in a compact under-seat form factor.
Focal Inside for BMW & MINI
The ISUB BMW 8 uses a Polyglass membrane and neodymium motor for tight, accurate bass. Its 8 ohm impedance matches factory Harman Kardon-equipped vehicles. An integrated interlocking mechanism clips directly into the original under-seat slots — no wire cutting or interior modifications needed. It also pairs with other Focal Inside Series kits for BMW and MINI, such as the Focal IC BMW 100L direct-fit coaxial speakers.
- Quick and easy installation
- No wires to cut, no interior modifications
- Improved sound quality over the factory unit
- Mounting accessories included
Explore the full range in Focal Inside.
Specification
| Magnet | Neodymium |
|---|---|
| Cone | Polyglass |
| Surround | Butyl |
| Impedance | 8Ω |
| Sensitivity | (2.83V/1m) 83dB |
More specs
| |
What's Included
- 1 Subwoofer
- 1 Foam gasket
- Four 1" Screws
- User manual
- Focal window sticker
- Adhesive backed Focal Inside badge
Focal
About the Focal ISUB BMW 8
From our tech experts at CEN
The Focal ISUB BMW 8 is an 8-inch (200mm) under-seat subwoofer from Focal's Inside Series, designed as a direct-fit replacement for BMW and MINI vehicles with factory Harman Kardon audio. It handles 90W RMS with a Polyglass cone and neodymium magnet, matched to an 8 ohm factory amplifier output.
Who it suits
BMW and MINI owners who want stronger, more accurate bass without cutting wires or modifying the interior. It suits anyone upgrading from the factory subwoofer while keeping a standard cabin appearance. Browse the full Focal range if you need components for other vehicles.
Our tech experts advise
Confirm your vehicle has the Harman Kardon factory fit before ordering, as other impedances — 2 ohm and 4 ohm — suit different system variants. The interlocking mechanism clips into the original under-seat slots using the supplied screws and foam gasket; no wire cutting is required. It pairs with other Focal Inside Series components for BMW and MINI. Professional fitting is priced per vehicle — see our car audio installation service.
Explore the full Focal range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all Focal
Recommended For You
Discover more top-rated gear, handpicked to go with what you're viewing
Have it Fitted By Our Team
Our team fits car audio, stereos, dash cams and vehicle security at our workshop in Beeston, Nottingham. Tell us your vehicle and we'll confirm the parts and a fitted price.
- 1
Tell us your vehicle
Make, model and year, and what you'd like fitted.
- 2
We confirm the parts
Fascia, wiring and interfaces checked for your car, with a fitted price.
- 3
Fitted at our workshop
Bring it to our Beeston workshop and we do the rest.
Unit 25 Technology Drive, Beeston, Nottingham NG9 1LA
Plug & Play Kits
Configure the solution best suited to your needs in just a few clicks.
Focal Inside Series
The Focal Inside offer is aimed at all drivers wishing to replace their car's original system with a hi-fi quality Plug & Play solution that integrates easily, without modifying the interior. Different configurations are available by brand (over 50 brands), by car model (1000 vehicle models).
Focal Car Audio
Deliver exceptional sound clarity and precision for your vehicle.
More from Focal Inside
More options from the same range, in stock and ready to go
Best SellerFocal Inside PW SUP 600 Amplifier Power Wiring Kit Impulse 4.320 FIT 9.660 Amp
£69.99
View product
Focal IC VW 165 Inside Series Direct Fit Volkswagen 6.5 Inch Coaxial Speakers
£139.99
Focal IC MBZ 100 Inside Series Direct Fit for Select Mercedes Coaxial Speakers
£299.99
Focal Inside Nissan Y-ISO T-Harness for Impulse 4.320 4 Channel Car Amplifier
£69.99
Focal Impulse 4.320 Amp Compact Digital 4 Channel Amplifier Class D 4x55w RMS
RRP £274.99Save 9%£249.00
Frequently Asked Questions
Q: What does RMS power mean?
A: RMS is the continuous power a subwoofer can handle, and it is the number that matters when matching an amplifier. Peak or max figures describe short bursts only. Match your amplifier output to the RMS rating in the Specification tab.
Q: Can CEN build or supply an enclosure and fit everything?
A: Yes. CEN supplies enclosures and offers professional installation from our Nottingham premises, including amplifier wiring. Contact us to discuss your build.
Q: Which BMW systems is the ISUB BMW 8 for?
A: It is the 8 ohm version, matched to BMW and MINI vehicles fitted with a factory Harman Kardon audio system. Contact CEN with your registration if you are unsure which version your car needs.
Q: Does the ISUB BMW 8 need a separate enclosure?
A: No. It clips into the original under-seat location using an integrated interlocking mechanism, with no wire cutting or interior modification.
Q: What's in the box with the ISUB BMW 8?
A: One subwoofer, one foam gasket, four 1 inch screws, a user manual, a Focal window sticker and an adhesive-backed Focal Inside badge.
Not Sure Where to Start?
Straightforward advice and the latest news from our Nottingham team.
All Guides and News →
Car Audio
Christmas Gift Guide 2026: Car Audio, Dash Cams and Outdoor Tech
Read the guide →
Car Audio
Upgrading Car Audio Without Replacing the Factory Stereo
Read the guide →
Car Audio
Amplifier Wiring Kits Explained: Gauge, Fuses and Earths
Read the guide →
Car Audio
New at CEN: Option Audio Drive-10Flat — Golf Mk8 Bass, Zero Boot Space Lost
Read more →
Car Audio
Car Speaker Sizes Explained: What Fits Your Car
Read the guide →
Car Audio
Alpine iLX-F905D Halo9 Review: The Big-Screen Upgrade for Almost Any Car
Read more →