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The Riverbank Stand at the Adelaide Oval has had its sound system upgraded with the introduction of a new L-Acoustics Kara system, supplied by Jands, L-Acoustics Certified Provider Distributor for Australia.

The system delivers improved coverage and intelligibility, all without the need for expensive acoustic treatment.

One of the venue’s three stands that were rebuilt as part of the redevelopment of the Adelaide Oval in 2014, the 14,000-capacity Riverbank Stand’s 12 storeys are covered by a single curved roof which has complex rigging requirements.

US-based acoustic design and consulting firm Wrightson, Johnson, Haddon & Williams (WJHW) were brought in to recommend a system for its upper tier audience areas and determined that Kara would be the ideal solution.

With a throw distance requirement in excess of 50 metre in some audience areas, Kara provides coverage and SPL for the entire upper tier audience in a high performance yet lightweight package.

Supporting WJHW designer Greg Swindle, the L-Acoustics Applications team provided electromechanical and system support, with L-Acoustics’ proprietary Soundvision software used to determine the positions and configuration of the arrays.

Commenting on the project, L-Acoustics Head of Integration, Dan Palmer advised “Soundvision gives an extremely accurate prediction of coverage, SPL and electromechanical parameters and was a useful tool for the WJHW design team to verify rigging points and system configuration.

“The rigging requirements were well detailed and, in turn, the Soundvision model generated by Greg was used to confirm coverage, SPL, and sight lines, and that all design and performance goals were met.”

Local specialist Novatech Creative Event Technology was initially asked to supply a demonstration system, which the venue reviewed over a two-month period.

It proved so successful that they were subsequently engaged to install the permanent system, which comprises three hangs of eight Kara in an LCR configuration, one hung centrally at the front of the stand’s roof, and the other two hangs positioned equidistantly to either side.

All are finished in white to blend with the architecture of the stand. The system is powered by six LA4X amplified controllers, mounted in a custom designed rack located in a temperature-controlled room and running on a UPS.

Novatech’s James Sacca added “the acoustics of the stand are challenging, particularly because of the dome structure roof, which causes large reflections. The directivity from the Kara system meant that we could reduce reflections and increase intelligibility, and the positioning and angles of the speakers achieves a uniform SPL across the audience area, which is exactly what was needed.

“The system also integrates into the emergency evacuation system and existing QSC Q-SYS control system, thereby doubling as an essential component of the venue’s voice alarm system, enabling delivery of clear, intelligible instructions to guests in the event of an emergency situation.”

Sacca notes that the infrastructure posed additional challenges, including the production of custom speaker brackets, which had to be engineered to suit the mounting, positioning and angling requirements of the arrays. He adds that the location of the installation, with fixing points situated over 35 metres from ground level, was probably the most difficult element of the job.

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