L-Acoustics SB28

Buy L-Acoustics SB28 : Ultimate High-Power Subwoofer for Live Sound & Installations

Introduction to the L-Acoustics SB28

In the world of professional audio, subwoofers are the heartbeat of every sound system. They deliver the low-end punch that gives music and speech a full, immersive impact. Among the many subwoofers available today, the L-Acoustics SB28 has become a global standard for live events, stadiums, theatres, and permanent installations.

Designed with dual 18″ drivers, advanced venting technology, and cardioid capability, the SB28 is built for one purpose: powerful, precise, and controlled bass performance.

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What is the L-Acoustics SB28?

The SB28 is a high-power, dual 18″ subwoofer designed to extend low-frequency performance in L-Acoustics line source systems like K1, KUDO, V-DOSC, and ARCS. With its bass-reflex enclosure and progressive laminar vents, it delivers clean, distortion-free bass down to 25 Hz, making it ideal for concerts and large-scale sound reinforcement.

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The Role of Subwoofers in Professional Sound Systems

Subwoofers are crucial for:

• Reproducing low frequencies that smaller speakers cannot handle

• Adding impact and energy to live music

• Ensuring audience immersion in large venues

Without a powerful sub like the SB28, a sound system feels incomplete and lacks depth.

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How the SB28 Complements L-Acoustics Main PA Systems

The SB28 was engineered as the perfect companion for L-Acoustics’ flagship line arrays:

• Extends low-end response to 25 Hz

• Matches seamlessly with K1 and KUDO systems

• Enhances ARCS and V-DOSC setups for permanent installations

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Key Features of the L-Acoustics SB28

Dual 18″ High-Excursion Drivers

The SB28 houses two long-excursion 18″ woofers with 4″ voice coils, allowing massive power handling while minimizing distortion. These drivers are designed for high output with low thermal compression, ensuring consistent performance at high volumes.

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Progressive Laminar Vents

Unlike traditional subwoofers, the SB28 features progressive-profile vents that allow laminar airflow. This innovation reduces port turbulence and unwanted noise, delivering cleaner bass even at maximum SPL.

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Cardioid Mode and Directional Bass Control

The SB28 supports cardioid configurations when combined with the LA8 amplified controller. This allows sound engineers to reduce rear radiation, preventing low-frequency buildup on stage and keeping the bass focused on the audience.

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Compatibility with LA8 Amplified Controller

With factory presets optimized for the LA8 controller, users can select between:

• 60 Hz and 100 Hz crossover points

• Cardioid or standard modes

This ensures the SB28 always performs at its best in different setups.

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Technical Specifications of the L-Acoustics SB28

Frequency Response and SPL Output

• Frequency response: 25 Hz – 100 Hz (±3 dB)

• Maximum SPL: 142 dB peak

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Power Handling and Impedance

• RMS power handling: ~1,225 W

• Nominal impedance: 4 Ω

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Dimensions, Weight, and Build Quality

• Dimensions: 1300 × 550 × 700 mm

• Weight: 93 kg (205 lbs)

• Construction: Baltic birch plywood with steel grille and acoustically transparent cloth

This heavy-duty design ensures durability for touring and reliability for installations.

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Applications of the L-Acoustics SB28

Touring and Live Concerts

For large-scale tours, the SB28 delivers the powerful bass impact needed to energize massive crowds.

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Outdoor Festivals and Stadiums

With its directional cardioid mode, the SB28 ensures sound is projected towards the audience, not wasted behind the stage.

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Permanent Installations

From theatres and houses of worship to sports arenas, the SB28 provides consistent, controlled bass in challenging acoustic spaces.

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Operating Presets and Configurations

Standard Mode (60 Hz and 100 Hz)

• SB28_60: Low-pass at 60 Hz for maximum extension

• SB28_100: Low-pass at 100 Hz for greater coupling with mains

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Cardioid Mode (SB28_60_C and SB28_100_C)

In cardioid setups, SB28 units are arranged front-to-back, reducing unwanted low-frequency spill behind the stage.

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Coupling with K1, KUDO, V-DOSC, and ARCS Systems

The SB28 is the ideal low-frequency companion to L-Acoustics’ main systems, ensuring seamless integration and consistent tonal balance.

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L-Acoustics SB28 vs. Other Subwoofers

SB28 vs. KS28

• SB28: Deeper extension (25 Hz), slightly older model

• KS28: Newer, lighter, more efficient

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SB28 vs. SB218

• SB28: Features laminar vents and cardioid presets

• SB218: More traditional design, less flexible

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SB28 vs. Meyer Sound & JBL Subwoofers

Compared to similar models from Meyer Sound and JBL, the SB28 stands out for:

• Directional bass control

• Low turbulence vents

• Seamless integration with L-Acoustics line arrays

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Pricing and Availability

New vs. Used Market Value

• New SB28s: Typically range around $10,000–$12,000 per unit

• Used SB28s: Often available for $4,000–$7,000, depending on condition

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Where to Buy L-Acoustics SB28

• Official L-Acoustics distributors

• Pro audio rental houses

• Secondary markets (Reverb, AVL exchanges, touring companies)

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FAQs About the L-Acoustics SB28

1. What frequency range does the SB28 cover?
It extends down to 25 Hz, providing deep, powerful bass.

2. Can the SB28 be flown in an array?
Yes, thanks to integrated rigging, it can be both flown and ground-stacked.

3. Do I need an LA8 controller to use the SB28?
While it can work with other amps, the LA8 controller unlocks factory presets for optimal performance.

4. Is the SB28 weather-resistant?
Yes, its components are treated for outdoor use, though long-term exposure should be avoided.

5. What’s the difference between SB28 and KS28?
The KS28 is the newer, more efficient model, but the SB28 remains highly reliable and widely used worldwide.

6. Is the SB28 suitable for small venues?
No, it is designed for large-scale concerts and installations, and would overwhelm small spaces.

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Conclusion: Why Choose the L-Acoustics SB28?

The L-Acoustics SB28 is more than just a subwoofer—it’s a professional tool for delivering chest-thumping, clean, and controlled bass at the world’s biggest concerts, festivals, and venues. With its dual 18″ drivers, advanced venting system, and cardioid capability, it remains one of the most respected subwoofers in the pro audio industry.

Whether you’re a touring company, rental house, or venue owner, the SB28 is a proven investment in reliable low-frequency performance.

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