L-Acoustics K Series and Source Intelligence Take On 5 Seconds of Summer’s 75-Foot Ring Stage L-Acoustics K Series and Source Intelligence Take On 5 Seconds of Summer’s...

Certified Provider Adlib designs a K1 and K2 concert sound system with no centre cluster, and runs Source Intelligence on four roaming lead vocals before the technology was publicly launched

LIVERPOOL, UK – September 2026 – The stage for 5 Seconds of Summer’s Everyone’s a Star! World Tour is a ring rather than a rectangle. The circle is 75 feet across: the band plays its upstage half against a curved video wall, and the downstage half is a curved thrust that carries them out into the room, ending at a second drum kit on an automated lift. The ground inside the ring is a VIP pit, so part of the audience stands within the circle. Every date runs on an L-Acoustics K Series system from UK Certified Provider Adlib, designed by Adlib audio systems engineer Billy Bryson and mixed at front of house by Sebastien Teti.

The tour opened at the SSE Arena Belfast on 26 March and runs through December, crossing UK and European arenas, North American arenas and amphitheatres, then South America, Australia, New Zealand and Asia. Capacities run from 8,000 to 20,000, and the show sounds just a good in all of them.

Teti came to the gig through the band’s drummer. “I received a call to mix Ashton Irwin’s solo project two years ago for a show in Los Angeles,” he says. “Since Ashton shares management with 5SOS, they asked me to take over FOH mixing duties for the band, right after the first day of rehearsals.”

L-Acoustics, and a Systems Engineer Who Specialises in It
Teti’s preference for the platform is unequivocal. “I find L-Acoustics to be the most musical-sounding speaker platform available,” he says. “From a mixing perspective, I don’t feel like I’m fighting aggressive system DSP or artificial processing. There is a distinct sonic signature, but it remains natural and transparent, giving me full control over my mix.”

Production management asked for his preference on the system. What he stressed was not a box count but a person. “I emphasised that having a dedicated Systems Engineer who is deeply invested and detail-oriented was critical,” he says. “Our System Engineer, Billy Bryson, has been all of that and more.” The two things are connected: an engineer who specialises in the platform, Teti adds, “offers a rare level of expertise, and I prefer working alongside someone who trusts the product as much as, or more than, I do.” Bryson has toured with the band since 2020.

No Centre Cluster, and a VIP Pit Inside the Ring

The geometry set the brief. Sound had to reach the VIP pit inside the ring and the thrust curving around it without the two spilling into each other, and without a centre cluster, which would have blocked sightlines to the video wall. Four members trade lead vocals as they move along the thrust, in front of an acoustic drum kit at full volume behind them.

Bryson’s answer was to treat the VIP pit as a room of its own. “Billy solved this during the design phase by engineering coverage to give that section the high-energy feel of an intimate club,” Teti says. “It sounds fantastic. I almost wish I could mix the show from down there.”

Source Intelligence Holds Four Lead Vocals Clear

The same design phase made the tour an early adopter of L-Acoustics Source Intelligence, running it before the technology was publicly launched in May 2026. Source Intelligence applies a machine learning source separation algorithm to a vocal channel in real time, stripping crowd noise, instrument bleed and PA spill and reducing everything that is not the voice by up to 40 dB. It runs four instances at once, exactly the number of lead vocals this show has.

“Being one of the early adopters testing L-Acoustics Source Intelligence was also critical, as it helped manage the bleed from four lead vocalists moving along the thrust, alongside an extremely loud acoustic drum kit on the mainstage,” Teti says. “Between L-Acoustics and Adlib, facilitating that tool has been a genuine game-changer compared to workflows I’ve used in the past.”

K1 and K2 Scale from Arenas to Amphitheatres

Bryson designed the system to hold its shape between the two venue types. The main hangs comprise up to 14 K1 and four K2 per side, the K2 Panflex fins set to minimise spill onto the thrust. Up to eight K1-SB per side fly directly behind them, with both the box count and the electronic steering of the low-frequency pattern reset venue by venue, so the sub coverage is shaped to each room. Side hangs of up to 16 K2 per side carry coverage to the 180-degree line.

A hang of four Kara II per side serves as in-fill, flown inboard of the main hangs to cover the VIP pit in stereo, the Panflex fins again turned to keep energy off the thrust and the main stage. Eighteen KS28, on Adlib’s custom touring dollies, are deployed end-fired at the outer edges of the circle, four of them in the centre for the VIP pit. Two A15 travel on the same dollies as out-fills, alongside two X12 for utility. Ten X8 front-fill the VIP pit from the downstage lighting shelf, and a further eight X8 on custom brackets line the outer perimeter of the thrust for nearfield imaging during the B-stage songs.

For the small number of larger venues that need them, delays comprise four hangs of six K2 with a flown LARAK II. Teti works over two X8 and an SB18 on an LA4X. Thirty-two LA12X drive the system, mostly in Adlib’s triple-wide racks each side of the stage, with a further LARAK II under the stage for the VIP and thrust fills, alongside five P1 processors and the L-ISA Processor II that Source Intelligence runs on.

“A K Series system was the clear choice for Seb and I, providing the precise control needed to work with the show’s design,” Bryson says. “The comprehensive tools in Soundvision allow the system to be scaled to fit venues of different sizes and tuned in detail for each room. This translates into excellent tonal consistency day-to-day, and has allowed us to deliver the same sonic signature as we’ve transitioned between arena and amphitheatre shows in the US.”

The Mix Translates onto Festival K Series Rigs
Two festival dates took the show off the touring system entirely. At Lollapalooza in Chicago, 5 Seconds of Summer played the main stage on the festival’s own L-Acoustics rig, specified by the festival rather than by Adlib, as it is for every act there.

“Beyond managing the thrust, we also navigated two major festival dates: one on a K2 deployment and another on a massive K1/K2/K-Sub rig on the main stage at Lollapalooza,” Teti says. “The transition was seamless, and the mix translated effortlessly. Moving from indoor arenas to outdoor amphitheatres brings its own set of variables, but Billy and I maintain constant communication. He works relentlessly to deliver daily system consistency, leaving the venue’s natural acoustic environment as the only real variable I have to account for.”

“Every interaction with the L-Acoustics team has gone above and beyond,” Teti says. The verdict he reports, though, is not his own. “Feedback from the band, management and fans has been nothing but positive,” Teti says. “Even in the most challenging acoustic environments we’ve encountered, the system has proven to be reliable, consistent, and exceptionally articulate.”

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