Case File: Naparima Bowl

Issue
As part of a broader renovation programme, Naparima Bowl identified a long-standing acoustic issue within the auditorium that needed to be resolved during the upgrade works. The primary concern was audible slap-back from the rear of the room, where sound energy from the stage and the installed sound system was reflecting off the back wall and returning into the seating area, negatively affecting the audience experience.

What Was Happening
The rear wall of the auditorium functioned as a large reflective boundary. Mid- and high-frequency energy travelled from the stage and PA system, struck the rear surface, and returned toward the audience with a slight time delay. These reflections were perceived as distinct echoes rather than reinforcement, increasing perceived loudness while reducing clarity and intelligibility within the space. Lower-frequency energy was also building up at the rear of the room, contributing to a sense of excess weight and reduced definition.

Constraints
All corrective work needed to be executed within the renovation timeline and without altering the fundamental structure of the auditorium. The rear wall followed a continuous curved geometry and formed a prominent visual element, requiring a solution that addressed acoustic performance while remaining consistent with the newly redesigned interior.

BEXtronics’ Approach
In consultation with the venue’s senior audio technician, the acoustic behaviour of the space was reviewed and the rear wall confirmed as a primary reflection and energy build-up zone. The existing fabric-covered fibre board treatment was assessed and determined to be inadequate for controlling both reflected energy and lower-frequency buildup. A revised treatment strategy was developed to improve absorption performance while integrating seamlessly with the room’s architectural and aesthetic requirements.

Solution Implemented
The existing wall finish was removed, the surface prepared, and new Noise Stop FabriSorb acoustic panels were installed across the full curvature of the rear wall. To enhance low-frequency absorption, the panels were deliberately installed with a controlled air gap between the panel backing and the wall surface. This design approach increases absorption effectiveness by allowing sound waves to interact with the panel over a greater depth, improving performance at lower frequencies where absorption is typically more difficult to achieve. Custom panel sizing ensured continuous coverage of the curved wall, and finishes were selected to complement the renovated auditorium.

Outcome
Rear-wall reflections were significantly reduced, eliminating audible slap-back and restoring clarity throughout the auditorium. The inclusion of an air gap behind the panels improved low-frequency control, resulting in a more balanced and controlled sound field. Sound from the stage and system now decays naturally without returning as delayed reflections, improving intelligibility and overall listening comfort for patrons. The work was completed efficiently as part of the renovation programme and integrated seamlessly into the upgraded space.

“BEXtronics made the process extremely easy from consultation through to installation.”
Dwight Forbes, Senior Audio Technician, Naparima Bowl