The CM 811 Flush Mount Ceiling Loudspeaker is designed for low ceiling applications in a public address system. The unit consists of a 200 mm dynamic full range loudspeaker driver, capable of delivering up to 104 dB of Sound Pressure Level (SPL). Coupled with the unit's frequency response of 50 Hz ~ 20 kHz, it gives the unit excellent speech and music reproduction properties.

The unit's built-in line matching transformer makes it suitable for a 70 V and 100 V distributed speaker system. Multiple power tappings on the transformer allows for outputs of 10, 5 and 2.5 W (100 V line system) / 5, 2.5 and 1.3 W (70 V line system)

The loudspeaker driver unit is mounted onto an aesthetically pleasing 265 mm circular metal grille finished with a matted surface in Pure White (RAL 9010). The whole unit is spring mounted to the ceiling board without any visible screw mounting holes and more importantly without any hassle.

There is also a back enclosure model available (CM 811E). With the metal back enclosure, crosstalk within the ceiling cavity can be prevented while acoustic damping material lining the enclosure reduces echoing.