Focal ISUB BMW 8 Inside Series Direct Fit Sub Under Seat Subwoofers 8ohm
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The Focal ISUB BMW 8 is a pair of 8-inch (200mm) passive under-seat subwoofers designed for direct fitment into BMW and MINI vehicles. Rated at 90W RMS each with 8-ohm impedance, they are part of Focal's Inside Series and are compatible with factory audio options including Harman Kardon systems.
These subwoofers are also compatible alongside other Focal Inside Series BMW and MINI fitment products, such as the Focal IC BMW 100L Inside Series coaxial speakers.
Key specifications
- Size: 8 inch (200mm)
- Fitment: BMW and MINI original under-seat subwoofer positions
- Impedance: 8 ohms
- Power handling: 90W RMS / 180W max
- Sensitivity: 89dB (2.83V/1m)
- Cone: Polyglass
- Magnet: neodymium
- Surround: butyl
Pair of ISUB BMW 8 8-ohm Harman Kardon replacement subwoofers
A direct-fit replacement subwoofer pair for BMW and MINI vehicles, built around Focal's Polyglass membrane and neodymium motor technology for powerful, accurate bass.
Focal Inside for BMW & MINI
The ISUB BMW 8 drops directly into the original under-seat subwoofer slots — no cutting or interior modifications required. The 8-ohm impedance ensures compatibility with factory audio systems including Harman Kardon. An integrated interlocking mechanism secures each unit in place.
- Quick and easy installation
- No wires to cut, no interior modifications
- Improved sound quality over factory subwoofers
- Mounting accessories included
Explore the full range in Focal Inside.
Specification
| Magnet | Neodymium |
|---|---|
| Cone | Polyglass |
| Surround | Butyl |
| Impedance | 8Ω |
| Sensitivity | (2.83V/1m) 89dB |
More specs
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What's Included
- 2 Subwoofer
- 2 Foam gasket
- Four 1" Screws
- User manual
- Focal window sticker
- Adhesive backed Focal Inside badge
Focal
About the Focal ISUB BMW 8 x2
From our tech experts at CEN
The Focal ISUB BMW 8 is a pair of 8-inch (200mm) passive under-seat subwoofers from Focal's Inside Series, designed for direct fitment into BMW and MINI vehicles. Each driver handles 90W RMS at 8 ohms, with a Polyglass cone and neodymium magnet. Both units are compatible with factory audio systems, including Harman Kardon.
Who it suits
BMW and MINI owners who want improved bass without cutting or modifying the interior will find these a straightforward upgrade. The 8-ohm impedance means they work directly with the factory head unit or Harman Kardon system. Owners of other vehicles may want to consider the Focal ISUB Twin as a universal underseat option.
Our tech experts advise
Each subwoofer drops into the original under-seat position using an integrated interlocking mechanism — no wiring cuts or interior modifications are needed. Foam gaskets and screws are included in the box. The ISUB BMW 8 is sold as a pair. Installation is priced per vehicle; visit our Nottingham fitting page to find out more.
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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
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- 2
We confirm the parts
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Bring it to our Beeston workshop and we do the rest.
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Plug & Play Kits
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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.
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Frequently Asked Questions
Q: Do I need an amplifier for this subwoofer?
A: Yes, unless it is an active (powered) subwoofer with a built-in amplifier. Passive subwoofers need an external amplifier matched to the RMS power and impedance shown in the Specification tab.
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: Is the Focal ISUB BMW 8 suitable for Harman Kardon systems?
A: Yes. The ISUB BMW 8 has an 8-ohm impedance, making it compatible with BMW and MINI vehicles fitted with a factory audio option, including Harman Kardon systems.
Q: Does the ISUB BMW 8 need an enclosure?
A: No. It fits directly into the original under-seat subwoofer slots, locking in place with an integrated interlocking mechanism, with no cutting or interior modifications.
Q: Do you get a pair of subwoofers?
A: Yes. The box contains two subwoofers, two foam gaskets, four 1 inch screws, a user manual, a Focal window sticker and an adhesive Focal Inside badge.
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