The Tannoy BACK CAN S is a rigid, steel enclosure accessory specifically engineered for use with compatible Tannoy PCI and QCI series in-ceiling loudspeakers. Its primary purpose is to provide a sealed, structurally solid back chamber that isolates the loudspeaker driver from the unconditioned space inside a ceiling plenum. When standard in-ceiling speakers are installed, the open cavity above the drywall can lead to compromised acoustic performance, including weak and uneven bass response, potential interaction with insulation, and sound leakage into other rooms. This steel back can installs directly behind the speaker, creating a defined, airtight volume that is acoustically tuned to work optimally with the driver's parameters, much like a traditional speaker cabinet, resulting in tighter, more accurate, and extended bass reproduction.

Constructed from heavy-gauge galvanized steel, the BACK CAN S is designed for durability and longevity in both residential and commercial environments. Its robust construction prevents flexing or resonance that could color the sound, ensuring the driver operates in a stable, controlled environment. The can features an integrated mounting system that secures firmly to the ceiling joists or framing, and its flange provides a solid surface for the speaker's baffle to mount against, improving overall mechanical stability and vibration damping. The sealed design also acts as a barrier against moisture, dust, and thermal insulation materials, protecting the speaker's components and maintaining performance consistency over time.

Installation of the BACK CAN S is considered a best practice for high-fidelity in-ceiling installations and is typically performed during the construction or renovation phase before drywall is applied. By providing a dedicated, optimized enclosure, it effectively transforms an in-ceiling speaker from a baffle-mounted driver into a performance closer to that of a high-quality bookshelf speaker. This accessory is essential for custom installers, integrators, and discerning homeowners who seek to realize the full sonic potential of their Tannoy in-ceiling speakers, ensuring precise, full-range sound that is consistent and predictable regardless of the ceiling's construction.