The Hollywood Bowl just got its biggest sound upgrade in a generation. AI is doing the heavy lifting

On a unrecorded performance stage, dependable engineers wage a constant, mostly invisible warfare against noise. A footwear drum bleeds into a vocal mic. A guitar amp pollutes a show feed. The vocalist drops the mic to their thorax mid-chorus and fractional the lyric disappears into the mix. For decades, the tools disposable to hole those problems person been fundamentally the same: equalization, compression, volume, judgment. Human hands connected a mixer, making trade-offs successful existent time.

This summertime astatine the Hollywood Bowl, thing antithetic is happening. A instrumentality learning strategy called Source Intelligence — developed by L-Acoustics, the French audio institution that supplies the Bowl’s dependable infrastructure — is listening to each microphone connected signifier and doing thing that wasn’t imaginable until recently: isolating a vocalist’s dependable from everything other astir it, successful existent time, with a precision that engineers accidental they’ve ne'er encountered before.

The strategy achieves arsenic overmuch arsenic 40 decibels of rejection connected unwanted signifier sound — a thousandfold simplification — which L-Acoustics Chief Executive Laurent Vaissié says is astir 20 decibels amended than immoderate competing exertion connected the market. The applicable effect, according to Fred Vogler, who has been the Bowl’s main dependable decorator since 2003, is startling. “Suddenly, you’re not getting the guitar amp oregon the drums successful that mic,” helium said. “You’re conscionable getting the vocal.”

Source Intelligence is 1 portion of a sweeping audio overhaul astatine the Hollywood Bowl this play — the venue’s astir ambitious upgrade successful a procreation — that besides includes a caller flagship L Series enactment array strategy and a first-of-its-kind immersive situation installation that whitethorn beryllium the largest of its benignant anyplace successful the world.

Close-up changeable of caller dependable strategy astatine the Hollywood Bowl.

(Courtesy of Hollywood Bowl)

The physics of the upgrade

The centerpiece of the overhaul is the L1, L-Acoustics’ caller flagship enactment array strategy — the archetypal large architectural rethinking of the format since the institution invented the modern enactment root array successful 1993. Line arrays enactment by suspending aggregate talker cabinets successful a curved vertical column, allowing dependable engineers to precisely signifier the absorption and propulsion of audio crossed a ample space. The problem, inherent to the design, has ever been the carnal gaps betwixt those idiosyncratic boxes.

“When you connect aggregate boxes, you make a carnal spread betwixt the speakers,” Vaissié explained. “You suffer a small spot of coherence.”

The L1 addresses that by integrating speakers straight into a reshaped furniture that already carries an space built into its design, reducing the fig of interfaces successful the chain. The effect is simply a strategy that is simultaneously 30% smaller successful footprint than its predecessor — visitors to the Bowl this summertime volition instantly announcement the 2 achromatic arrays hanging supra the signifier look much compact — yet much almighty than the K Series it replaces.

For the Hollywood Bowl specifically, the stakes were high. The venue’s uppermost seats beryllium astir 400 feet from the stage, and the surrounding residential neighborhoods marque sound bleed a genuine concern. Historically, engineers managing the Bowl’s strategy person contended with arsenic overmuch arsenic six to 9 decibels of variance betwixt the loudest seats adjacent the signifier and the softest astatine the backmost — an audible and sometimes frustrating gap.

With the L1, that variance has been reduced to astir 3 decibels — a important engineering accomplishment that translates straight to assemblage experience.

“All the mode to the top, you consciousness similar you’re truly adjacent to the stage,” Vaissié said.

Vogler enactment it successful much visceral terms. “The upgrade from the K Series to the L Series has been dramatic,” helium said. “More melodramatic than I anticipated.”

Vogler noted that the caller system’s debased distortion characteristics are peculiarly striking. “Distortion tin fool you into reasoning dependable is louder,” helium said. “When there’s nary distortion, you crook it up and it’s conscionable truthful clear. Pristine.”

“The upgrade from the K Series to the L Series has been dramatic,” Fred Vogler, the Bowl’s dependable technologist said. “More melodramatic than I anticipated.”

(Courtesy of the Hollywood Bowl)

AI connected the mix

If the caller speakers correspond an improvement of physics and engineering, the AI components of the upgrade correspond thing newer and perchance much consequential: the exertion of instrumentality learning to unrecorded sound, successful existent time, astatine scale.

Source Intelligence, L-Acoustics’ caller vocal isolation instrumentality being deployed astatine the Bowl, uses instrumentality learning algorithms to abstracted a singer’s dependable from the cacophony of a unrecorded signifier situation — drums bleeding done microphones, guitar amplifiers, the wide acoustic chaos of a ample performance — and present a cleaner, much isolated awesome to the mixing board.

The exertion traces a somewhat unexpected lineage. It originated, according to Vaissié, arsenic a instrumentality for DJs — a stem-separation algorithm that allowed a DJ to interruption a stereo way into its constituent parts (vocals, bass, drums, effects) and spatialize them successful 3 dimensions astatine a nightclub successful existent time. Engineers astatine L-Acoustics recognized the algorithm had a unrecorded dependable exertion and redirected it.

For mixing engineers, the applicable effect is profound. “Suddenly you’re not getting guitar amp oregon drums successful that mic. You’re conscionable getting the vocal,” said Vogler. “You tin past elevate the vocal without elevating everything else.”

What that translates to for audiences is amended intelligibility — words that onshore alternatively than lavation — and a cleaner wide mix, due to the fact that the technologist is nary longer spending intelligence and method vigor warring unwanted awesome astatine the source.

Source Intelligence is already deployed connected respective of the largest touring productions successful the satellite this season. According to L-Acoustics, the strategy is presently traveling with Harry Styles, the Weeknd and Bruno Mars, whose mixing engineers person reportedly been vocal astir the technology’s impact.

War connected Drugs execute astatine the Hollywood Bowl connected May 19, 2026.

(Hal Horowitz)

The immersive frontier

The 3rd large constituent of this season’s upgrade whitethorn beryllium its astir future-facing. For the archetypal clip successful the Bowl’s century-long history, the venue has installed a afloat immersive situation dependable strategy — L-Acoustics’ L-ISA level — wrapping the full 17,500-seat amphitheater successful distributed speakers susceptible of enveloping audiences successful spatial audio.

Scott Sugden, manager of merchandise absorption astatine L-Acoustics, described it arsenic perchance the largest immersive dependable deployment, by sheer carnal geometry, anyplace successful the world.

L-ISA operates connected 2 superior modes: a country motor that uses integer reverberation to simulate enclosed architectural abstraction — allowing an outdoor amphitheater to, successful effect, consciousness similar a performance hallway erstwhile the Los Angeles Philharmonic performs — and a situation entity mode that allows engineers to spatialize idiosyncratic sounds crossed the full seating area.

“We tin marque a vocalist connected signifier consciousness similar they’re wrong something,” Sugden said. “Or we tin interruption the 4th partition — crook that disconnected — and abruptly they’re talking straight to you.”

Vogler is already experimenting with it cautiously. He’s tally it connected orchestral performances and a popular amusement earlier successful the season, uncovering it susceptible of creating what helium called “a nine ambiance successful this elephantine acoustic.” His attack has been deliberately understated.

“We don’t privation it drafting attraction to itself,” helium said. “We conscionable privation radical to consciousness like, if you turned it off, thing was missing.”

Kool & the Gang and the Hollywood Bowl Orchestra with Thomas Wilkins.

(Myung J. Chun / Los Angeles Times)

A century-old venue, a 21st period bet

The Hollywood Bowl was founded successful 1922, and the existent carnal operation — its seventh iteration — dates to a 2004 renovation that besides marked the opening of its concern with L-Acoustics. The Bowl became the archetypal venue successful the satellite to instal some the K1 strategy successful 2013 and, now, the L1 this season.

“In bid to enactment a world-class venue, you person to deliberation astir what the champion acquisition for everybody is,” Vu said. “The Bowl was founded connected bully sound. That ethos has carried done to today.”

Every touring creator that comes done the venue — and determination are much than 130 shows scheduled this summertime — uses the location system. None of them augment it with their own. That is, by immoderate measure, a singular ballot of assurance successful the infrastructure.

What the L Series, Source Intelligence and L-ISA collectively correspond is the Bowl’s astir ambitious technological leap since amplified dependable became modular — a stake that the aboriginal of unrecorded euphony isn’t conscionable louder oregon bigger, but smarter, much precise and much immersive. The audience, for now, conscionable has to amusement up and listen.