L-Acoustics - KS21i
The L-Acoustics KS21i is a high-power subwoofer housing a single 21-inch neodymium cone driver, designed to fly alongside A15i line source arrays using dedicated rigging accessories. It shares the KS21's 29 Hz low frequency limit and 138 dB peak SPL while weighing 3 kg less, making it the integrated flying variant in the A-series ecosystem.
Specifications
- Configuration: Omni or cardioid subwoofer
- LF transducer: 1 x 21-inch neodymium cone driver
- Acoustical load: Bass-reflex
- Low frequency limit (-10 dB): 29 Hz
- Max SPL (peak): 138 dB at 1 m (LA2Xi bridge mode, LA4X, LA8, or LA12X)
- Nominal impedance: 8 ohms
- Weight: 46 kg / 101 lb
- Dimensions (H x W x D): 752 mm x 569 mm x 629 mm
- IP rating: IP55
- Amplifier compatibility: LA2Xi, LA4X, LA8, LA12X
- Rigging: Compatible with A15i-BUMP, A15i-RIGBAR, A15KS-Ui, A15i-TILT accessories
Applications
The KS21i is used in touring and large-venue production where subwoofers need to fly as part of an integrated A15i array system. It supports standard omnidirectional and cardioid directivity configurations. Cardioid mode reduces stage wash and improves audience-side low-frequency uniformity. Compatible rigging accessories enable vertical deployment above or below A15i line source elements.
Frequently asked questions
How does the KS21i differ from the KS21?
The KS21i weighs 46 kg versus the KS21's 49 kg and is built to fly alongside A15i line source systems via dedicated rigging accessories. Both share the same 21-inch driver, 29 Hz low frequency limit, and 138 dB peak SPL.
Which amplifiers are compatible?
The LA2Xi (bridge mode for full output), LA4X, LA8, and LA12X are all compatible.
Does the KS21i support cardioid mode?
Yes. Both standard omnidirectional and cardioid configurations are supported.
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.