Sonance Small Round Retrofit Enclosure – Sound Isolation Back Box

Product Overview

The Sonance Small Round Retrofit Enclosure is a back box built for Visual Performance Series in-ceiling speakers installed in existing, finished ceilings. It is designed for integrators handling retrofit jobs where the wall cavity above the speaker cannot be inspected or controlled ahead of time. The enclosure isolates the speaker from the ceiling cavity to protect sound quality and installation consistency.

Product Description

On a retrofit job, the space above a ceiling is often unknown territory — insulation, ductwork, and framing can all vary the effective air volume behind a speaker, which changes the way it sounds from room to room. The Small Round Retrofit Enclosure solves this by enclosing the back of a compatible Sonance Visual Performance Series speaker in a sealed, glass-reinforced polypropylene housing, cutting sound spillover into the cavity above by roughly 20dB. That isolation keeps bass response and tonal balance consistent regardless of what is hiding above the ceiling tile or drywall, and it reduces noise transfer to the room or floor above, which matters in multi-tenant buildings and condominiums. The enclosure is built for the "cut in and go" nature of retrofit work: it is sold as a pair and fits directly into the standard round cutout used for compatible in-ceiling speaker models without requiring access to the structure above. Because the housing is molded polypropylene rather than sheet metal, it is lightweight enough to install one-handed while working overhead. Retrofit integrators typically pair one enclosure with each speaker location in a two-speaker zone, since the part is sold in pairs.

Key Features

• 20dB Sound Isolation — Reduces sound spillover into the ceiling cavity above the speaker.
• Retrofit-Ready Design — Built for existing finished ceilings without access to the structure above.
• Glass-Reinforced Polypropylene — Lightweight, durable housing that installs quickly overhead.
• Consistent Tonal Performance — Minimizes the effect of unpredictable wall cavity conditions on speaker sound.
• Sold in Pairs — Matches typical two-speaker zone installations.

Typical Applications

• Retrofit installations in existing homes and multi-family units
• Condominiums and apartments where sound transfer to adjacent units is a concern
• Renovation projects using Sonance Visual Performance Series speakers

Technical Specifications