This is an installation accessory, not a speaker. The Large Round Retrofit Enclosure is a back can that mounts behind an 8-inch round in-ceiling speaker in the Sonos Architectural by Sonance range, and it ships as a pair. Retrofit enclosures drop into ceilings that are already finished, so an installer can add proper acoustic containment without opening up drywall or building a new soundproofing assembly.
The enclosure gives the driver a sealed, consistent volume of air to work against. That matters twice over: bass response stops depending on whatever random cavity size happens to sit above the ceiling, and sound stops leaking into the room, hallway, or bedroom on the other side. Sonance rates the reduction in spillover into adjacent spaces at up to 20 dB, which is the difference between a media room that stays contained and one the whole house hears.
Construction is glass-reinforced polypropylene, so the can resists moisture and will not sag or warp the way fiber alternatives can. Typical applications include upstairs ceilings above bedrooms, multi-tenant and condo work, hotel and office jobs with sound-isolation requirements, and any install where an inspector or spec calls for enclosed in-ceiling loudspeakers.
Key Features
- Retrofit back-can enclosure for 8-inch round in-ceiling speakers in the Sonos Architectural by Sonance line
- Reduces sound spillover into adjacent rooms by up to 20 dB
- Installs into existing finished ceilings, no new construction required
- Glass-reinforced polypropylene housing
- Delivers a consistent sealed air volume for predictable low-frequency behavior
- Supplied as a pair, matching the pair packaging of Sonos Architectural speakers
Why Buy This From 4TEC Direct
4TEC Direct is an authorized Sonos dealer, backed by 4TEC Integration — the commercial AV design and installation firm we have run since 2003, with over 35 years of combined experience in commercial AV design, programming, and sales. The people who answer your call are the same engineers who scope conference rooms, training centers, and whole-home audio systems every day.
- Authorized Sonos dealer — genuine, factory-fresh product with full manufacturer warranty
- Certified designers and programmers on staff — CTS, CTS-D, and CTS-I credentialed
- Free pre-sale system design — call before you order and we will spec the right zones, amps, and speakers
- Professional installation and 24/7/365 managed support available through 4TEC Integration
- Serving clients since 2003 from Omaha / Gretna, Nebraska — shipping nationwide
Questions before you buy? Talk to a real AV engineer: 402-909-0130 or sales@4tecdirect.com.