The Tannoy BACK CAN IW Back Can Kit is an accessory designed to enhance the performance of compatible Tannoy in-wall loudspeakers by providing a sealed, rigid enclosure within the wall cavity. Its primary function is to create a controlled acoustic environment for the speaker driver, which is critical for achieving optimal bass response and overall sound quality. When in-wall speakers are installed in a standard stud wall, the open cavity behind them can act as an infinite, damped baffle, often leading to weak, undefined low frequencies and potential interaction with insulation or structural elements. The back can kit installs directly behind the loudspeaker, forming a sealed, air-tight chamber of a specific volume that is acoustically tuned to work with the speaker's Thiele-Small parameters, much like a traditional speaker cabinet.

Constructed from durable, acoustically inert materials such as molded plastic or composite, the back can is designed to be installed during the construction or renovation phase before the wall's drywall is applied. It typically mounts securely between the wall studs and provides a rigid flange to which the in-wall speaker baffle can be attached. This rigid mounting eliminates vibration and resonance from the wall structure itself, improving midrange clarity. The sealed enclosure prevents sound waves from the rear of the driver from canceling out the front waves (a phenomenon called acoustic short-circuiting), resulting in tighter, more extended, and more accurate bass reproduction. It also provides a barrier against moisture, dust, and insulation fibers from entering the speaker chamber.

Installation of the BACK CAN kit is considered a best practice for high-fidelity in-wall installations, transforming a raw in-wall speaker into a performance closer to that of a high-quality bookshelf or monitor speaker in a proper enclosure. It is an essential component for custom installers and audiophiles who are serious about achieving the full potential of their in-wall loudspeaker system, ensuring consistent, predictable performance regardless of the wall's construction and contents. By providing a dedicated, optimized enclosure, this kit allows Tannoy's in-wall speakers to deliver the detailed, balanced sound they were engineered to produce.