Among the renovations was the installation of a powerful sound system capable of delivering announcements clearly audible over the roar of 90,000 cheering fans. TOA brought in technology and expertise from Japan, but also worked with local Indonesian partners to create and build this sound system.

To achieve good sound reproduction in the higher frequency ranges—usually considered difficult with horn speakers—TOA developed a unique driver unit employing a ring-shaped diaphragm, which is the first of its kind in the world. We also improved the driver’s overall durability by incorporating a radiation fin with a new shape, and installed 8-horn speaker arrays utilizing these new drivers in twelve locations around the stadium. In addition, combining each horn array with a Line Array Speaker Type C subwoofer ensures adequate coverage in the lower frequency ranges, thus achieving both the level of sound pressure and good sound quality required in such a large, open outdoor space.

This sound system is the largest TOA has ever installed in a stadium of this scale. It’s clear, uniformly distributed sound and acoustic environment delivering realism and power will be relied upon to convey the excitement of sporting matches, and its high-definition sound quality will undoubtedly be utilized for all manner of musical performances and other live events in the future.