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Martin Audio Torus installed at Tsukuba’s Capio Hall

The Tsukuba Capio complex in Japan’s Tsukuba city, Ibaragi, incorporates indoor sports halls, theatres and meeting rooms. Capio Hall recently underwent a major sound system overhaul, and new rigs were introduced, including the new Martin Audio Torus as the main PA.

“Originally, the proscenium centre loudspeakers were exposed, and a cluster of several point-source systems was flown from the grid”, explains Nobuhito Endo, technical manager of rental company Sigma Communications. “Naturally, we considered utilising a line array replacement but found a problem. While the hall wasn’t very deep, the three-storey horseshoe layout of the auditorium was vertically too great for the coverage angles. It was quite clear that a considerable number of line array cabinets would be needed if we wanted to provide complete vertical area coverage from its highest point, without converging on the frame of the stage.” It’s then that the Constant Curvature array solution came to mind.

During the renovation process a vertical array comprising four cabinets - two each of the T1215 and T1230, offering 15° and 30° vertical dispersion respectively - were deployed in grids at the proscenium to cover the vertical 90°, angled to deliver the sound from the third floor to the front seat of the first floor. Furthermore, a Martin Audio XD12, supplemented by SX118 subwoofer, was specified for the side column and powered by iK42 DSP amplifiers. For infills and balcony seats, six Blackline X8 were deployed.

“Originally, we planned a front wide/back narrow dispersion pattern, but as we adjusted this while listening to the sound, we discovered that specifying everything to a horizontal 90 degrees would give a better coverage”, says Takahisa Ota, who was responsible for the tuning of the system. “In that way, the proscenium could cover 80 percent of the venue. We adjusted the delays and SPL of the Blackline X8s so that they were blended to the proscenium, to cover the remaining tiny area.”

(Photos: Martin Audio)

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