L-Acoustics SB28 Subwoofer | Dual 18″ High-Power Subwoofer
$2 700,00
L-Acoustics SB28 Subwoofer
The L-Acoustics SB28 Subwoofer is a high-power professional subwoofer designed to deliver powerful, extended low-frequency performance for demanding sound reinforcement applications. Featuring two 18-inch low-frequency transducers in a bass-reflex enclosure, the SB28 was engineered for large-scale professional audio systems where deep bass, high output, and reliable performance are essential.
Designed by L-Acoustics for professional sound reinforcement, the L-Acoustics SB28 Subwoofer was developed as a complementary low-frequency enclosure for systems including K1, KUDO, V-DOSC, and ARCS. According to L-Acoustics documentation, the SB28 can extend the combined system operating range down to 25 Hz, making it suitable for applications where powerful and controlled low-frequency reproduction is required.
L-Acoustics SB28 Subwoofer Features
The L-Acoustics SB28 Subwoofer combines two high-performance 18-inch low-frequency drivers with a bass-reflex cabinet. Its enclosure and vent design were developed to maximize acoustic efficiency while reducing unwanted turbulence and maintaining consistent performance at high output levels.
Key features include:
* Dual 18-inch low-frequency transducers
* Bass-reflex enclosure design
* Low-frequency limit down to 25 Hz
* Maximum SPL of up to 142 dB with the specified preset
* 1225 W RMS handling capability with the specified preset
* Professional-grade Baltic birch plywood construction
* Integrated rigging rails
* Standard and cardioid operating modes
* Designed for use with L-Acoustics amplified controllers
* L-Vents/laminar airflow technology
* Suitable for touring, concerts, events, and professional installations
These characteristics make the L-Acoustics SB28 Subwoofer an effective choice for professional systems requiring strong low-frequency output and dependable operation.
Dual 18-Inch Low-Frequency Performance
At the heart of the L-Acoustics SB28 Subwoofer are two 18-inch low-frequency transducers. The dual-driver configuration provides substantial acoustic displacement and allows the enclosure to deliver the high output expected from a professional touring subwoofer.
The specially designed drivers feature high excursion capability and are built to maintain performance under demanding operating conditions. This is particularly important in concert sound, where subwoofers can be required to reproduce significant amounts of low-frequency energy for extended periods.
The SB28 is capable of producing frequencies down to 25 Hz using the specified configuration, giving sound engineers access to deep bass reproduction for music genres and applications that demand extended low-frequency response.
Professional Bass-Reflex Enclosure
The enclosure design of the L-Acoustics SB28 Subwoofer plays an important role in its acoustic performance. The SB28 uses a bass-reflex architecture designed to increase efficiency in the low-frequency range.
L-Acoustics incorporated progressive-profile vents to promote smoother airflow and reduce turbulence. This design approach helps the subwoofer maintain clean and powerful bass reproduction when operating at high output levels.
For professional sound systems, enclosure design is just as important as the drivers themselves. A properly engineered bass-reflex enclosure can help maximize acoustic output while maintaining useful low-frequency extension.
L-Acoustics L-Vent Technology
One of the notable technologies associated with the L-Acoustics SB28 Subwoofer is its laminar venting approach. L-Acoustics introduced this technology with the SB28, using a progressive vent profile designed to reduce turbulence and improve airflow.
Reduced port turbulence can be particularly valuable when a subwoofer is working at high sound pressure levels. By improving airflow through the enclosure, the design contributes to the SB28’s ability to produce powerful low-frequency output.
The L-Vent concept has also influenced the design of later L-Acoustics low-frequency products.
High SPL Output
The L-Acoustics SB28 Subwoofer was designed for applications where high acoustic output is essential. Manufacturer specifications list a maximum SPL of up to 142 dB when used with the specified preset and measurement conditions.
High SPL capability makes the SB28 appropriate for large professional sound reinforcement systems, particularly applications where audiences need to experience powerful low-frequency impact over significant distances.
Whether used for live music, touring productions, festivals, or large events, a high-output subwoofer can provide the low-frequency headroom required for modern professional sound systems.
Cardioid Subwoofer Applications
The L-Acoustics SB28 Subwoofer can be configured for cardioid operation using the appropriate processing presets and physical system configuration.
Cardioid subwoofer arrangements are useful when sound engineers need to control low-frequency energy behind the subwoofer array. Reducing rearward radiation can help improve the overall working environment on stages and around performance areas.
The L-Acoustics preset guide includes SB28 configurations for standard operation, cardioid operation, and extended cardioid configurations. This provides system designers with options for adapting the subwoofer deployment to different venue and production requirements.
LA8 Amplified Controller Integration
The L-Acoustics SB28 Subwoofer is designed to work with L-Acoustics amplified controller technology. The LA8 platform provides DSP processing, crossover functions, system equalization, and protection functions for compatible loudspeaker systems.
This integrated approach allows the SB28 to be operated as part of a properly configured L-Acoustics system rather than simply treating it as a conventional passive subwoofer.
The DSP environment can provide the appropriate crossover and system presets needed to optimize the subwoofer for its intended application.
Professional Construction
The L-Acoustics SB28 Subwoofer features a cabinet constructed from high-grade Baltic birch plywood. The enclosure uses substantial plywood construction intended for the demands of professional sound reinforcement and touring environments.
The cabinet incorporates integrated rails for rigging and system integration. Its physical dimensions are approximately 1300 mm wide, 550 mm high, and 700 mm deep, with a net weight of approximately 93 kg (205 lb), according to the manufacturer’s specifications.
Because the SB28 is a large dual-18-inch enclosure, proper transportation, handling, lifting, and system deployment procedures should always be followed.
Applications
The L-Acoustics SB28 Subwoofer can be used in a variety of professional audio applications, including:
Concert Sound
Live concerts require subwoofers capable of delivering powerful bass while maintaining consistency across demanding performance conditions. The SB28 was designed for professional concert sound reinforcement and can complement large L-Acoustics systems.
Touring
Touring productions need loudspeakers that can withstand repeated transportation and deployment. The SB28’s professional cabinet construction and integrated rigging features make it suitable for demanding production environments.
Festivals
Outdoor festivals often require substantial low-frequency output to cover large audiences. Multiple SB28 enclosures can be deployed as part of a larger L-Acoustics sound reinforcement system.
Large Events
Corporate events, entertainment productions, sporting events, and other large-scale productions can benefit from powerful subwoofer systems when music and program material require strong low-frequency reproduction.
Professional Installations
The SB28 can also be used in suitable permanent or semi-permanent professional sound reinforcement systems where its output capability and system compatibility meet the project requirements.
Why Choose the L-Acoustics SB28 Subwoofer?
The L-Acoustics SB28 Subwoofer remains a notable professional subwoofer for users looking for a high-output dual-18-inch design. Its combination of deep frequency extension, high SPL capability, professional construction, and L-Acoustics system integration makes it particularly attractive to professional audio companies and sound engineers.
The dual 18-inch configuration provides substantial low-frequency displacement, while the bass-reflex enclosure and vent design help optimize acoustic performance.
For users already working with compatible L-Acoustics systems, the SB28 can also provide a practical way to build a coherent low-frequency system using manufacturer-designed presets and amplification platforms.
System Design and Deployment
Proper deployment is important when using the L-Acoustics SB28 Subwoofer. The performance of a professional subwoofer depends not only on the enclosure but also on the number of cabinets, physical configuration, amplification, DSP presets, crossover settings, and acoustic environment.
For large systems, professional system-design software and manufacturer-approved presets can help engineers model coverage and optimize system performance.
The SB28 supports different operating configurations, including standard and cardioid arrangements. Choosing the correct configuration depends on the application, venue, desired coverage, and low-frequency control requirements.
Used L-Acoustics SB28 Subwoofer
The L-Acoustics SB28 Subwoofer is also of interest in the professional used audio equipment market. When purchasing a used SB28, buyers should carefully inspect the cabinet, drivers, connectors, grille, rigging hardware, and internal components.
It is also important to verify that the subwoofer has been tested and that both 18-inch drivers are operating correctly. Signs of excessive cone damage, unusual mechanical noise, cabinet damage, or modified wiring should be investigated before purchase.
For professional buyers, confirming the physical condition and service history of a used SB28 can help ensure reliable performance after installation.
L-Acoustics SB28 Subwoofer Specifications
Important manufacturer specifications for the L-Acoustics SB28 Subwoofer include:
* Configuration: Dual 18-inch subwoofer
* Frequency limit: 25 Hz with specified preset
* Maximum SPL: Up to 142 dB with specified preset
* RMS handling: 1225 W with specified preset
* Transducers: 2 × 18-inch LF drivers
* Nominal impedance: 4 ohms
* Dimensions: 1300 × 550 × 700 mm
* Weight: Approximately 93 kg / 205 lb
* Cabinet: Baltic birch plywood
* Connector: 1 × 4-pin Speakon
* Rigging: Integrated rails for flying and stacking
Specifications may depend on the selected preset and system configuration, so professional users should consult the manufacturer’s documentation before deployment. (L-Acoustics)
Conclusion
The L-Acoustics SB28 Subwoofer is a powerful professional dual-18-inch subwoofer designed for demanding sound reinforcement applications. With deep low-frequency extension, high SPL capability, professional Baltic birch construction, integrated rigging features, and compatibility with L-Acoustics amplification and processing, the SB28 is built for serious professional audio systems.
For concert production, touring, festivals, large events, and professional sound reinforcement, the SB28 provides the low-frequency performance required to complement high-output L-Acoustics loudspeaker systems.
If you are looking for a professional dual-18-inch subwoofer with deep bass extension and high-output capability, the L-Acoustics SB28 Subwoofer remains a strong option for professional audio applications.
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