L-Acoustics - SB18 IIi
The L-Acoustics SB18 IIi is a high-power 18-inch passive subwoofer configured for permanent installation, delivering 138 dB maximum SPL with selectable omnidirectional or cardioid directivity in a dual bass-reflex enclosure with a push-in terminal block for fixed-installation wiring.
Specifications
- Transducer: 1 x 18-inch high-excursion cone driver
- Acoustical load: Dual bass-reflex with L-VENTS laminar venting
- Maximum SPL: 138 dB (with LA2Xi bridge mode, LA4X, LA8, or LA12X)
- Low frequency limit: 32 Hz (-10 dB)
- Nominal impedance: 8 ohms
- Directivity: Omnidirectional or cardioid configurations
- Dimensions (H x W x D): 701 x 540 x 728 mm (27.6 x 21.2 x 28.7 in)
- Weight: 48 kg / 106 lb
- Cabinet material: Premium-grade Baltic birch plywood
- Finish options: Dark grey-brown (Pantone 426 C), pure white (RAL 9010), custom RAL on request
- Front grille: Coated steel with acoustically neutral 3D fabric
- Connectors: 1 x 4-point terminal block with push-in connection
- IP rating: IP55
- Compatible amplifiers: LA2Xi (bridge mode), LA4X, LA8, LA12X
Applications
The SB18 IIi suits fixed installations in large theatres, concert halls, houses of worship, and sports facilities where permanent high-power subwoofer integration is required. Its terminal block wiring and additional finish options make it suited to installations where appearance and clean cable management matter. Cardioid configuration reduces low-frequency energy behind the array for improved on-stage clarity.
Frequently asked questions
What distinguishes the SB18 IIi from the SB18?
The SB18 IIi is the installation-oriented variant of the SB18. It uses a 4-point terminal block connector rather than speakON for permanent wiring, offers pure white and custom RAL finish options in addition to dark grey-brown, and weighs 48 kg compared to the touring SB18 at 52 kg. Maximum SPL and frequency extension are identical.
Is the SB18 IIi compatible with the LA2Xi amplifier?
Yes. The SB18 IIi is compatible with the LA2Xi operating in bridge mode, as well as the LA4X, LA8, and LA12X. The touring SB18 does not list LA2Xi compatibility.
Does the SB18 IIi support cardioid deployment?
Yes. Cardioid directivity is achieved by arranging multiple SB18 IIi units with specific DSP presets in an L-Acoustics amplified controller, reducing rear radiation and improving bass control in the listening area.
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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FAQs
What is your return policy?
All refunds and returns are determined by the manufacturer's terms of sale. Change-of-mind refunds are not accepted, but all valid warranty claims will be managed by AKA Acoustics in compliance with consumer law.
How long will it take to receive my order?
Freight lead times will be provided upon order confirmation. Standard items typically ship within 4–6 weeks, while custom orders may take 6–12 weeks.
Is my payment information secure?
Yes, all payments are securely processed through Stripe and are protected under their Terms of Service. AKA Acoustics do not store any payment information ourselves.
How are freight costs calculated?
Freight costs are determined at the time of quotation to ensure accurate pricing based on your specific order. For any questions, please email sales@akaacoustics.com
How can I contact support?
For account inquiries, email accounts@akaacoustics.com. For order support, email sales@akaacoustics.com.