The Tannoy CMS 803 PI 16 OHM BACKCAN is a specialized accessory enclosure engineered for use with the 16-ohm variant of the CMS 803 PI pre-install in-ceiling loudspeaker series. This back can serves the essential purpose of creating a sealed, fire-resistant rear chamber when the loudspeaker is installed in suspended or open-plenum ceilings. By enclosing the back of the speaker, it isolates the driver's rear acoustic output from the often cluttered and acoustically absorptive ceiling void. This isolation prevents sound wave cancellation and loss of bass energy, ensuring the loudspeaker delivers its intended frequency response, efficiency, and overall sonic performance. The sealed environment also protects the speaker's internal components from dust, insulation fibers, and debris, contributing to long-term reliability.

As a pre-install accessory, this back can is designed for integration during the initial construction or renovation phase before ceiling finishing is complete. It is constructed from robust, fire-retardant materials that help maintain the fire integrity rating of the ceiling assembly, a critical consideration for commercial building codes and safety standards. The unit features a secure twist-and-lock attachment mechanism that allows it to be quickly and firmly fastened to the compatible CMS 803 PI 16-ohm loudspeaker chassis after it is placed into the cut-out. This creates a single, rigid, and integrated assembly that is both acoustically and mechanically sound.

The design includes pre-formed knock-outs for easy and tidy cable entry, facilitating a professional installation. By optimizing the operating conditions for the loudspeaker, this dedicated back can is a crucial component for audio installers seeking to achieve the full performance potential of the CMS 803 PI series in applications such as offices, retail spaces, hotels, and educational facilities where acoustic consistency, safety compliance, and system longevity are key requirements.