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Description
LAB PreFab™ Sealed Under-Seat MDF Enclosure Box for Single 12" Round Car SubwooferWhat kind of subwoofer does this fit? This enclosure is precision built for a single shallow mount 12" round subwoofer. The cutout diameter is exactly 11. 00" and it is engineered specifically for low profile, slim drivers requiring a maximum mounting depth of 4. 50". Will it fit in my vehicle? Yes, it features a specialized angled underseat footprint designed to slide directly into the tight clearance areas beneath your vehicle's seating. Its low
What kind of subwoofer does this fit?
This enclosure is precision-built for a single shallow-mount 12" round subwoofer. The cutout diameter is exactly 11.00" and it is engineered specifically for low-profile, slim drivers requiring a maximum mounting depth of 4.50".
Will it fit in my vehicle?
Yes, it features a specialized angled underseat footprint designed to slide directly into the tight clearance areas beneath your vehicle's seating. Its low-profile wedge design (6.75" front height tapering down to 5.00" rear height) makes it an excellent choice for pickup trucks, crew cabs, and compact vehicles where vertical space is highly restricted. The exact external dimensions are 14.25" W x 14.00" D x 6.75" H1 (Front) / 5.00" H2 (Rear).
How is the performance and wiring?
This enclosure features a completely airtight sealed chamber optimized to extract clean, highly responsive, and musical low-end transients from shallow-mount 12-inch drivers. The space-conscious underseat alignment delivers impactful near-field bass reinforcement directly into the passenger cabin while keeping your trunk or rear cargo area entirely unobstructed. It comes equipped with a high-grade speaker terminal cup featuring gold-plated binding posts for secure, reliable wiring connections.
LAB PreFab™ Enclosures: Premium Off-The-Shelf Performance
LAB PreFab™ enclosures are the highest-quality prefabricated speaker boxes on the market. Proudly made in the USA and constructed of solid CNC-cut high-grade MDF (medium density fiberboard), these cabinets offer exceptional durability and acoustic rigidity. Whether you are looking for an install-friendly solution or an efficient space-saver, the LAB PreFab™ series delivers reliable, solid performance without the custom-shop price tag or wait times.
Available in both ported and sealed configurations, each cabinet is built with tight construction tolerances and covered in high-grade automotive carpet to blend seamlessly into your vehicle's interior. It is the ultimate plug-and-play solution for daily commuters and car audio enthusiasts who want high-quality bass without sacrificing cargo space.
The PreFab™ Advantage:
- Solid American Construction: Designed, cut, and assembled in California, USA using precision CNC machinery and high-grade MDF.
- Low-Profile Underseat Wedge: Specifically contoured to slide beneath passenger or rear benches to maximize available legroom and cargo space.
- Airtight Performance: Assembled with high-strength wood glue and complete internal sealing to ensure zero panel flex and an absolute airtight enclosure environment.
Technical Specifications:
- Single 12-inch sealed underseat round woofer enclosure
- Angled underseat wedge design profile
- Compatible with one (1) shallow-mount 12" round subwoofer
- Constructed of 0.63" CNC-cut high-grade MDF
- Airtight sealed internal chamber for tight, accurate bass transient response
- High-grade black automotive carpet finish
- Standard speaker terminal cup with gold-plated binding posts
- Made in California, U.S.A.
- Enclosure volume: ~0.45 ft^3
- Sub cutout diameter: 11.00"
- Max mounting depth: 4.50" (Shallow-mount)
- Dimensions: 14.25"W x 14.00"D x 6.75"H1 (Front) / 5.00"H2 (Rear)
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.9 ★★★★★
Based on 2149 reviews
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Product Reviews
★★★★★ 5
Great product
Fits our 2012 X5d perfectly. Do yourself a favor and youtube the process for replacing these. You'll see it's well worth doing yourself rather than paying a shop that charges a BMW premium on everything.
Also something I learned recently... this is a low cost high charge item at the mechanic. A lot of times when they suggest replacing these it's because they just tick the box and don't actually look at them. We had our mechanic admit this on a recent service where it was suggested to replace, when we had just done it ourselves in April.
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Reviewed in the United States on July 23, 2023
★★★★★ 5
Perfect fit for our 2018 X5 35D
Perfect fit. Never replaced a filter in this car before and took me only 13 minutes. I timed it lol.
That includes taking some before and after pictures from the old and new filter.
What is worth mentioning is that the car was until now under the “fake maintenance” from BMW that comes with a new car and goes until 36.000 miles.
Up to this mileage there is no other service the. The oil changes (3) due. The first real checkup is at a higher mileage and not covered anymore.
Anyway , those filters where replaced before from a BMW dealership. When I compare the new filters and the filters I took out of the car they look the same.
I was expecting to find some BMW marks on the installed filter but perhaps they don’t put their name in it anymore??? Or it could be they also put “after market” parts in.
Anyway, BMW quoted me in all seriousness 700 dollar to replace those filters and the Inside filter
The inside filter is on its way and is 25 dollar. Together with those filters the parts came to 55 dollar and I guess a total of 30 minute of work.
Well done BMW, lol.
We all need to make a living buy that should be considered “robbery”
Anyway, if you thinking about replacing those filters then go for it.
It’s not complicated and all you need is a screw driver to get one plastic river out that you can push back in once you are done.
Those filters here from MANN are the real deal and fit perfectly and state that they are made in Germany. I have no reason not to believe it.
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Reviewed in the United States on April 28, 2020
★★★★★ 5
Excellent Product
It works really well. I used it on quarter tank and drove about 6 miles then filled up with top tier gas and my MPG went up by 3 miles on Highway and about 2 MPG city driving. At first there may be slight hesitation as it clears carbon. Then runs smooth as silk.
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Reviewed in the United States on May 10, 2026
★★★★★ 5
Quality product
Seeing as it passed the smog test without any issues, it seems this product worked exactly as intended.
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Reviewed in the United States on May 20, 2026
★★★★★ 5
So far so good
It seems to be working well, so far. The check engine light turned off and the my vehicle seems to be running well. Be sure to follow the instructions. A while back, I wasted some money on a different catalytic converter cleaner because I put the cleaner in on a full tank of gas. It's best to wait until you're at a half tank or less of gasoline before you put in your catalytic converter cleaner. Also, I drove around right after I put in the catalytic converter cleaner and before I filled up my tank again. A couple of days later, I went to the gas station and topped off my tank. Again, it seems to be running well for now.
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Reviewed in the United States on April 21, 2026