L-Acoustics | SB18 IIi - High power subwoofer (install)

L-Acoustics | SB18 IIi - High power subwoofer (install)

The L-Acoustics SB18 IIi is the installation version of the SB18, a high-power 18 inch subwoofer that delivers up to 138 dB SPL with extension down to 32 Hz. With a dual bass-reflex enclosure, external rigging kits and a permanent-install connector, it is designed for venues, theaters and architectural projects that need deep, controlled low end.

Deep bass, designed for fixed installations

Fixed installations have different requirements than touring rigs: a clean look, reliable cabling and long-term durability. The L-Acoustics SB18 IIi delivers the same powerful low-frequency performance as the SB18 in a version made for permanent use. Its 18 inch driver reaches down to 32 Hz (-10 dB) with a peak SPL of 138 dB at 1 m, giving your system real weight and impact.

Tight, controlled low end

The dual bass-reflex enclosure and high-excursion driver are designed for maximum output and bandwidth with low distortion. The result is bass that stays defined and musical, whether you are reinforcing speech, film soundtracks or live music.

Easy to integrate

The SB18 IIi has a 4-point terminal block with push-in connection, which makes permanent wiring quick and tidy. Rigging is done with external rigging kits, so you can stack or fly the subwoofer to suit your installation. Combine two or more units with the matching presets to create standard or cardioid arrays and keep low frequencies out of areas where you do not want them.

Built to last

The cabinet is made of premium-grade Baltic birch plywood and the driver is protected by a coated steel grille. At 48 kg, it is lighter than the touring SB18, and with an IP55 rating it is made for long-term use in demanding environments.

Typical applications

• Theaters, auditoriums and concert halls
• Houses of worship and cultural venues
• Clubs, bars and hospitality venues
• Corporate facilities, conference centers and cinemas
• Sports venues and leisure facilities

Pair it with

The SB18 IIi complements L-Acoustics coaxial enclosures and modular line sources, and is driven by an L-Acoustics amplified controller such as the LA2Xi (bridge mode), LA4X, LA8 or LA12X. For smaller systems that need a more compact subwoofer, take a look at the SB15M.

Want to know more?

Planning a fixed installation and not sure how many subwoofers you need or how to configure them? Contact us and we'll be happy to advise.

Acoustical

• Low Frequency Limit (-10 dB): 32 Hz
• Maximum SPL: 138 dB with LA2Xi (bridge mode) / LA4X / LA8 / LA12X; 133 dB with LA2Xi
• Nominal Directivity (-6 dB): Standard or cardioid
• Transducers: 1 × 18" cone driver
• Acoustical Load: Dual bass-reflex
• Nominal Impedance: 8 Ω

Physical

• Connectors: 1 × 4-point terminal block with push-in connection
• Rigging and Handling: External rigging kits
• Dimensions (H × W × D): 701 × 540 × 728 mm
• Weight (Net): 48 kg
• Cabinet: Premium-grade Baltic birch plywood
• Front: Coated steel grille, acoustically neutral 3D fabric
• Finish: Dark grey brown Pantone 426 C; pure white RAL 9010; custom RAL code on special order
• IP Rating: IP55