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Axiom Audio Supports Unique Opera Performance In Oklahoma With L-Acoustics

Kara enclosures and SB18 subs support production of Verdi’s “Rigoletto” for socially distanced crowd at Tulsa Drillers baseball stadium.
Axiom Audio deployed cart-based L-Acoustics Kara/SB18 arrays along ONEOK Field’s left and right foul lines for the Tulsa Opera’s production of Verdi’s Rigoletto.

A unique early October performance of Verdi’s iconic opera Rigoletto by the Tulsa (Oklahoma) Opera staged at ONEOK Field, home of the Tulsa Drillers minor league baseball team, was reinforced with L-Acousitcs Kara loudspeakers provided by locally-based Axiom Audio.

The system, designed to provide coverage to 1,685 socially-distanced audience members seated in the 2,700-capacity venue, consisted of 24 Kara enclosures, six SB18 subwoofers, and three four-speaker clusters of Kiva II used as center and side fills, all powered by six LA12X and three LA4X amplified controllers. These components were on an Optocore fiber network that also included a DiGiCo SD10 FOH mixing console paired with two SD-Racks.

Stadium management wouldn’t permit the rigging necessary to fly the system to be erected on the field’s grass areas, as would typically be done in an outdoor location such as this one. Instead, taking inspiration from Super Bowl music system configurations, the Kara loudspeakers were loaded onto nine wheeled carts. These lined the first and third baselines, four per side, facing the grandstands, with the ninth cart positioned at home plate, just in front of the low risers that were the stage for six orchestra members: two violins, viola, cello, bass, and piano. The arrangement provided the necessary coverage for all of the widely-spaced grandstand seating.

However, it also created the added challenge of putting loudspeakers on the field because the opera vocalists, unfamiliar with wearing wireless microphones, would roam about during the performance, creating the potential for feedback each time they neared a loudspeaker cluster. The response was to make each cart its own node on the system, putting each of the nine speaker pods on a matrix at front of house, allowing mix engineer Steve Colby to turn off individual loudspeaker clusters as a performer approached one.

“We made the speakers individually controllable through the matrix,” says Axiom Audio President Ben Bruce. “Performers were moving all across the infield, and they’re opera singers, so they would be loud. Having individual control over the elements in what was essentially a distributed audio system greatly reduced the potential for gain-before-feedback. The Kara speakers were a perfect fit, in terms of size and power, for this.”

Colby adds, “Kara’s coverage properties allowed for a large and effective stereo field between any two of the arrays deployed around the field. As a result, we could pan vocals and effects a little farther apart than usual without diminishing the experience for audience members who were not centered between the arrays. In particular, this was noticeable with the amount of artificial acoustic ‘space’ we created using a touch of reverb. The available SPL and overall fidelity of the speakers are quite amazing given the compact size and light weight of the product.

The Tulsa Opera performing Rigoletto at ONEOK Field. (Photo credit: Shane Bevel)

“We were able to produce excellent coverage from a very small footprint,” he continues. “Ben Bruce at Axiom deserves all credit for laying out the speaker arrays and planning coverage. We planned to go with his existing L-Acoustics inventory from the start, so we discussed the extent of the COVID-defined seating, sightline issues, and my desire to have all the arrays be independently fed, and he ran with it, designing a system with excellent coverage and fidelity.”

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Bruce credits the L-Acoustics components for letting the opera happen without a hitch, concluding, “That really began back in the shop, where we used L-Acoustics Soundvision to design the speaker placements. It was spot-on; when we arrived at the field with barely a day to set up, the angles were perfect. We positioned the boxes on the carts at the shop, and they were ready to roll. We had clarity and intelligibility, which are crucial for a show like this.”

Go here to view the Tulsa Opera’s production of Rigoletto.

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