The Tannoy CMS801-PI 8 OHM BACKCAN is a dedicated back can enclosure specifically designed for the CMS 801 Pre-Install (PI) series of ceiling loudspeakers. This accessory is an essential component for professional installations where the loudspeaker is mounted in a ceiling with an open plenum space above, such as in a commercial drop-ceiling grid. The primary function of the back can is to provide a sealed, rigid enclosure behind the speaker driver, which is critical for proper acoustic performance. Without this sealed back volume, a ceiling speaker would perform poorly, with weak bass response and potential phase cancellation. The back can creates the necessary air spring for the driver to operate as designed, ensuring full, accurate bass reproduction and protecting the driver from dust and debris in the plenum.

Constructed from durable, non-resonant materials, the CMS801-PI BACKCAN is engineered to match the precise dimensions and mounting requirements of the CMS 801 PI speaker. It typically installs above the ceiling tile, with the loudspeaker then mounted into the back can from below, forming a complete, optimized speaker system. Using the manufacturer-designed back can guarantees compatibility and ensures the speaker achieves its specified Thiele-Small parameters, delivering the intended frequency response and output. For integrators, this accessory streamlines the installation process and ensures consistent, reliable acoustic results across all speaker locations in a project.

In commercial audio system design, the proper use of back cans like the Tannoy CMS801-PI 8 OHM BACKCAN is a standard practice for professional-grade results. It transforms a ceiling speaker from a compromised component into a fully realized transducer capable of delivering the high-quality, full-range audio the CMS 801 series is engineered for. This attention to acoustic detail is fundamental for achieving clear, impactful sound in background music, paging, and distributed audio systems, ensuring the installed system performs to its maximum potential.