Used L-Acoustics KS28
Used L-Acoustics KS28 subwoofers are high-power, dual 18-inch direct-radiating touring subs built for arenas, festivals and theatres where precise, clean low-frequency reproduction is essential. Second-hand KS28 units are a proven choice for professionals running K1, K2, Kara or A Series systems. Browse the used KS28 listings available right now by scrolling below.
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L-Acoustics KS28 specifications
| Brand | L-Acoustics |
| Segment | Audio |
| Speaker Type | Sub Woofer |
| Typical used price | €24,705 (range €5,883–€26,250) |
About the L-Acoustics KS28
The L-Acoustics KS28 is a reference touring subwoofer featuring a dual 18-inch, direct-radiating design with advanced L-Vents laminar airflow technology that reduces turbulence and port noise, delivering clean, extended low-frequency performance into infrasonic territory with massive headroom and ultra-low distortion. The KS28 pairs with K1, K2, Kara and A Series line array systems and is optimised for use with LA12X amplified controllers. Common configuration ratios include 1:2 with K2 and 1:3 with KARA II setups, making the subwoofer a flexible choice across concert tours, festival stages, arenas and theatres.
L-Acoustics KS28 — buyer FAQs
What is the L-Acoustics KS28 and what is it designed for?
The L-Acoustics KS28 is a high-power touring subwoofer built around a dual 18-inch, direct-radiating design. Its L-Vents laminar airflow technology reduces turbulence and port noise, extending clean low-frequency output into infrasonic territory with ultra-low distortion. It is designed for demanding professional applications including arena tours, festival stages and theatre installations where precise, high-headroom low-frequency reproduction is required.
Which speaker systems does the KS28 pair with, and are there recommended configuration ratios?
The KS28 is matched to L-Acoustics K1, K2, Kara and A Series line array systems. Common configuration ratios are 1:2 with K2 and 1:3 with KARA II, allowing engineers to scale the sub complement to the main hangs for a given venue. The KS28 is also optimised for use with LA12X amplified controllers.
Who makes the KS28 and where does it sit in the L-Acoustics range?
The KS28 is made by L-Acoustics, a French professional audio manufacturer credited with pioneering modern line array technology. Within the L-Acoustics range the KS28 is positioned as the reference touring subwoofer, intended to work alongside the company's flagship K1 and K2 line array systems as well as Kara and A Series cabinets in large-scale touring and installation contexts.
What affects the price of a used KS28?
Used KS28 pricing varies with condition, age and what is included. Units offered as matched sets with dollies and protective covers typically command more than single cabinets sold without accessories. Configuration history, such as ex-demo versus well-toured stock, also influences value. Check the live listings on this page for current asking prices, and note that many listings carry a Make an Offer option.
What should I check when buying a second-hand KS28?
Inspect each driver cabinet for signs of heavy touring wear, check that the L-Vents ports are undamaged and unobstructed, and confirm the amplified controller pairing, since the KS28 is optimised with the LA12X. When buying in a set, verify that all units are from the same production batch if consistent sonic matching matters. Every 10K Used listing includes a 21-day warranty covering major functional faults; full details are in the buying guide at 10kused.com/used-av-equipment-guide/.
