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30cm Subwoofers

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30 CM • 12 INCHES • CAR AUDIO

30 cm subwoofers for cars

Discover our 30 cm / 12-inch car subwoofers: active and passive models, Bass Reflex, Bandpass, slim, single or dual subwoofer enclosures for Car Audio installations seeking powerful, deep bass.

12-INCH SUBWOOFER ENCLOSURE

One of the essential formats in Car Audio

The 30 cm subwoofer is a true classic in car audio. The 12-inch subwoofer offers a large cone area while remaining versatile enough to be used in many vehicles, from everyday music systems to high-power installations.

30 cm Car Audio classic
12 inches Car subwoofer
Single 1 × 30 cm subwoofer
Dual 2 × 30 cm subwoofers
WHY CHOOSE A 30 CM?

A large cone area in a still versatile format

The 30 cm allows for the construction of systems capable of providing significant bass without necessarily moving up to very large 38 or 46 cm diameters.

Powerful bass

The 30 cm diameter offers a large radiating area. Paired with a suitable subwoofer, enclosure, and amplification, it can provide high bass levels.

Great versatility

The 12-inch comes in many configurations: sealed, Bass Reflex, Bandpass, slim, active or passive.

Single or dual 12"

You can choose an enclosure equipped with a single subwoofer or a dual 30 cm configuration when more radiating area is desired.

Musical or SPL

Depending on its design, a 30 cm enclosure can be intended for everyday listening, a powerful installation or an SPL-oriented project.

30 CM BASS REFLEX ENCLOSURE

A very common architecture in 12 inches

The Bass Reflex enclosure uses a port tuned to its internal volume. The port contributes to the acoustic radiation around its tuning zone, which notably allows for greater efficiency in a specific frequency range.

Many 30 cm enclosures offered in this category use this architecture.

SEVERAL DESIGNS

Bass Reflex, Bandpass, slim, or active

Two enclosures using exactly the same subwoofer diameter can offer very different results. The speaker design is therefore just as important as the speaker diameter.

Bass Reflex Enclosure with port
Bandpass Bandpass enclosure
Slim Shallow depth
Active Built-in amplifier

Sealed 30 cm enclosure

The sealed enclosure works without a port. Its internal volume must be matched to the subwoofer to achieve its intended performance.

30 cm Bass Reflex enclosure

The Bass Reflex uses a port whose dimensions and tuning are linked to the enclosure volume and the subwoofer. It is a very common design in Car Audio.

12" Bandpass enclosure

The Bandpass uses several acoustic volumes and can provide significant efficiency over a range of frequencies depending on its design.

12" slim enclosure

A slim enclosure prioritizes a shallow depth to facilitate the installation of a 30 cm subwoofer when available space is limited.

AMPLIFIED 30 CM ENCLOSURE

A 12-inch subwoofer with its built-in amp

An amplified 30 cm subwoofer enclosure directly integrates the amplification required by the subwoofer. This solution avoids the installation of a separate bass amplifier.

The category includes several 12-inch active models. It is still necessary to provide power, a ground, and a suitable audio connection.

DUAL 30 CM ENCLOSURE

Two 12-inch subwoofers for more surface area

The dual 30 cm enclosure is very common in the Car Audio world. With two subwoofers, the total radiating area increases significantly compared to a single identical speaker.

2 × 30 cm

Dual enclosures combine two 12-inch subwoofers in the same enclosure. They are offered in different power levels and architectures.

Matched amplification

On a passive dual enclosure, always check the final impedance and RMS power to correctly select the amplifier.

HIGH POWER • SPL

The 30 cm for powerful Car Audio installations

The 12-inch format is also very common in high-power systems. The selection includes enclosures ranging from affordable solutions of several hundreds of RMS Watts to dual configurations exceeding 1000 W RMS.

At these levels, amplification is only part of the system: battery, alternator, wiring, protections, and the quality of connections must also be correctly sized.

More Watts does not automatically mean more bass.

RMS power indicates the electrical capacity of the system, but does not allow you to predict the sound level on its own. The subwoofer's efficiency, excursion, enclosure design, tuning, amplifier, and vehicle also strongly influence the result.

BUYER'S GUIDE

How to choose your 30 cm subwoofer enclosure?

Before looking only at power, start by determining the available space, the type of bass desired and the amplification you want to use.

✓ Dimensions — measure your trunk
✓ Type — active or passive
✓ Architecture — sealed, BR, Bandpass, or slim
✓ Configuration — single or dual 12"
✓ Power — compare the RMS Watts
✓ Impedance — check amp compatibility
WHAT AMP FOR A 12"?

Properly match the 30 cm enclosure and its amplifier

For a passive enclosure, check the RMS power but especially its impedance. The amplifier must be able to operate properly at this load and deliver power consistent with the enclosure used.

MAJOR CAR AUDIO BRANDS

Ground Zero, Rockford Fosgate, Hifonics, DD Audio & more

Find 30 cm enclosures from Sound Auto Concept Ground Zero Audio, Rockford Fosgate, Hifonics, DD Audio, Alpine, Deaf Bonce, ESX Car Audio, GAS Audio Power, JBL, and other specialized Car Audio brands.

FREQUENTLY ASKED QUESTIONS

FAQ – 30 cm / 12-inch subwoofer enclosures

Why choose a 30 cm subwoofer enclosure?

The 30 cm offers a large cone area while remaining a very common format in Car Audio. It exists in a wide variety of power levels and designs.

Are 30 cm and 12 inches the same thing?

Yes. The term 12 inches corresponds to the category of approximately 30 cm. Precise dimensions may vary slightly depending on the manufacturer.

What is the difference between an active and passive 30 cm enclosure?

The active enclosure has its amplifier built in. The passive model requires an external amplifier matched to its power and impedance.

30 cm Bass Reflex or sealed enclosure?

The two architectures work differently. Bass Reflex uses a tuned port while the sealed enclosure works without a port. The best choice depends on the subwoofer and the desired result.

What amp to choose for a 30 cm enclosure?

Check the RMS power and impedance of the enclosure. You then need to look at the power actually delivered by the amplifier at this same impedance.

Is a dual 30 cm enclosure much more powerful?

Two identical subwoofers increase the available radiating area. However, the final result also depends on the amplification, the enclosure, the power supply and the installation.

25 cm or 30 cm enclosure?

The 25 cm can facilitate a more compact installation. The 30 cm offers more cone area, but generally requires a larger enclosure.

Is a 30 cm enclosure suitable for SPL?

Yes, some 30 cm models are designed for high-power or SPL-oriented systems. However, not all 12-inch enclosures are intended for this use.

Can you connect a 30 cm enclosure to a factory car stereo?

Yes. With an active enclosure or an external amplifier, it is possible to retain many factory systems. A high-level input, an HP to RCA converter or a specific interface may be necessary.

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