Hollywood Bowl venue debuts its biggest sound upgrade in a generation

The Hollywood Bowl has rolled out the biggest sound system overhaul of its modern era this summer, centered on an artificial-intelligence tool that isolates a singer's voice from the noise of a live stage, the Los Angeles Times reported. The new tool, called Source Intelligence, was built by the French audio company L-Acoustics and uses machine learning to strip out bleed from drums and guitar amps in real time, achieving about 40 decibels of noise rejection, which the company's chief executive, Laurent Vaissié, said outperforms every rival product on the market by roughly 20 decibels.

Sound engineers at concerts have long fought stage noise by hand, riding faders to fix the same problems again and again, a guitar amp bleeding into a vocal mic, a kick drum swallowing a lyric. Source Intelligence grew out of an algorithm originally built for club DJs to split a track into its vocal, bass and drum parts, and gives engineers a cleaner signal before they even touch a knob. Fred Vogler, the Bowl's sound designer since 2003, said the effect on his mixing board has been dramatic, since isolating the vocal lets him raise it "without elevating everything else."

Alongside the AI tool, the Bowl installed a new L1 flagship line array from L-Acoustics, a speaker system roughly 30% smaller than its predecessor but more powerful. Vaissié said the redesign narrowed the volume gap between the loudest seats near the stage and the softest ones roughly 400 feet back, cutting what had been a six-to-nine decibel swing down to about three decibels. The Bowl was the first venue anywhere to install L-Acoustics' earlier K1 system in 2013, and it is now the first to install the L1.

For the first time in its more than 100-year history, the 17,500-seat amphitheater has also added a full immersive surround system known as L-ISA, which L-Acoustics product director Scott Sugden called potentially the largest deployment of its kind anywhere by sheer physical scale. Source Intelligence is already traveling this season with major touring acts including Harry Styles, the Weeknd and Bruno Mars, and Vogler said he has begun experimenting cautiously with the surround system on both orchestral concerts and pop shows, aiming for effects subtle enough that audiences would only notice them if they were switched off.

More than 130 shows are booked at the Bowl this summer, and none of the touring productions bring their own sound system, relying instead on the venue's house rig. The Bowl, founded in 1922 and rebuilt into its current form in a 2004 renovation, has partnered with L-Acoustics ever since, and this upgrade marks its deepest step yet into pairing live orchestral and pop programming with computer-driven audio processing.