Alpine DP2-45C-B 2 Way Plug & Play 4.5" 12cm Component Speakers for BMW 50w RMS
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The Alpine DP2-45C-B is a plug-and-play 2-way component speaker set from Alpine's Digital Precision Series, sized at 12 cm (4.5 inch) and rated at 50W RMS. It is designed exclusively for selected BMW 3 Series, 4 Series, M3 and M4 G-series models (2018–2024), using hybrid fibre woofers and Tetoron soft dome tweeters.
This listing is the 12 cm (4.5 inch) set. The Alpine DP2 BMW component speaker range is also available in the 10 cm (4 inch) DP2-40C-B.
Key specifications
- Type: 2-way component, plug and play for BMW
- Woofer size: 12 cm (4.5 inch)
- Tweeter size: 2.5 cm (1 inch) Tetoron soft dome
- Power handling: 50W RMS, 100W peak
- Frequency response: 90 Hz to 20 kHz
- Cone: hybrid fibre (bulletproof fibre and carbon fibre)
- Surround: H.A.M.R multi-roll
Upgrade your BMW sound system with the DP2-45C-B
12 cm (4.5 inch) 2-way component speakers designed for the BMW 3 Series and other compatible BMWs.
The DP2-45C-B is part of Alpine's Digital Precision Series, tailored exclusively for BMW. The Tetoron soft dome tweeters deliver clarity and fast dynamics, while the 12 cm mid-range woofers produce powerful mid-bass with texture and accuracy across a wide frequency range.
Plug-and-play functionality means the speakers connect directly into the existing BMW wiring without modification.
Compatible cars
- BMW 3 Series G20: 11/2018 – 08/2024
- BMW 3 Series G21: 07/2019 – 07/2024
- BMW 3 Series G80 (M3 Limousine): 11/2020 – 07/2024
- BMW 3 Series G81 (M3 Touring): 11/2022 – 07/2024
- BMW 4 Series G22: 07/2020 – 03/2024
- BMW 4 Series G23: 11/2020 – 03/2024
- BMW 4 Series G26: 07/2021 – 07/2024
- BMW 4 Series G82 (M4 Coupe): 11/2020 – 07/2024
- BMW 4 Series G83 (M4 Cabrio): 07/2021 – 03/2024
Note: if your car is not listed, please send us a message.
Easy integration with BMW sound systems
The DP2-45C-B is confirmed compatible with the BMW models listed above. Plug-and-play design means no cutting or adapting — it drops straight into the existing setup for a quick, clean upgrade.
Exclusive HAMR surround
Alpine's High Amplitude Multi-Roll (HAMR) surround allows greater maximum and linear cone excursion for high SPL. It maintains control over the cone at every excursion stage, delivering powerful bass and clean sound.
Hybrid fibre diaphragm
The woofer cone combines bulletproof fibre and carbon fibre for a construction that is rigid yet lightweight. This keeps cone movement accurate and limits distortion, resulting in a natural mid-range and strong bass extension.
Tetoron soft dome tweeter
The Tetoron soft dome tweeter is lightweight and durable, with a wide frequency response that captures fine detail across the audio spectrum — from subtle passages to full-volume crescendos, across all genres.
Explore the full range in Alpine Plug & Play.
Specification
| Frequency response | 90Hz-20KHz |
|---|---|
| Rate Power | 50W RMS |
| Peak Power | 100W |
| Woofer size | 12 cm (4.5") |
| Tweeter size | 2.5 cm (1") |
More specs
| |
What's Included
- Alpine DP2-45C-B Speaker Set
Alpine
About the Alpine DP2-45C-B
From our tech experts at CEN
Vehicle-specific speakers designed for the BMW, so they fit the factory locations using the existing mounting points and connectors rather than needing adapter rings cut to fit.
Who it suits
BMW owners who want a real improvement over the factory speakers with no cutting or fabrication. Plug-and-play sets like this are the usual starting point, because the work is contained and the result is immediate.
Our tech experts advise
They will play louder and cleaner with an amplifier behind them, and doors usually benefit from sound deadening before you hear what the speakers can really do. Model years and trim levels vary, so get in touch to confirm this set suits your exact vehicle. See car audio installation.
Explore the full Alpine range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all Alpine
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Frequently Asked Questions
Q: Will these speakers fit my car?
A: Most car speakers are standard sizes, but mounting depth and fitting rings vary by vehicle. Check the size in the Specification tab against your vehicle, or contact CEN with your registration and we will confirm fitment and any adapters or fitting kits you need.
Q: Do I need an amplifier to run these speakers?
A: Not always. Most speakers will run from a standard head unit, but a dedicated amplifier lets them perform at their best, particularly for component sets and higher power handling models. The RMS figure in the Specification tab is the guide to how much clean power they can use.
Q: What is the difference between coaxial and component speakers?
A: Coaxial speakers combine the tweeter and woofer in one unit for a simple like-for-like upgrade. Component sets separate the tweeter and woofer with a crossover for better imaging and detail, and suit installs where sound quality is the priority.
Q: Do these come as a pair?
A: Unless stated otherwise, car speakers are sold in pairs. Check the product title and What's Included tab, which lists exactly what is in the box.
Q: Can CEN fit these speakers for me?
A: Yes. CEN offers professional installation from our Nottingham premises. Contact us to book an installation slot or ask for a fitting quote.
Q: What size are the Alpine DP2-45C-B speakers?
A: The DP2-45C-B has 12 cm (4.5 inch) woofers and 2.5 cm (1 inch) Tetoron soft dome tweeters.
Q: Which BMWs does the DP2-45C-B fit?
A: It is designed for the BMW 3 Series (G20, G21, G80 M3, G81 M3 Touring) and 4 Series (G22, G23, G26, G82 M4 Coupe, G83 M4 Cabrio) from 2018 to 2024. See the compatible cars list for exact dates, and contact CEN if your car is not listed.
Q: What is the difference between the DP2-45C-B and DP2-40C-B?
A: Both are 2-way component sets for the same BMW models with 50W RMS power handling. The DP2-45C-B has 12 cm (4.5 inch) woofers, while the DP2-40C-B has 10 cm (4 inch) woofers.
