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More details on the PSB CS BCN800
CustomSound Series Back Box: The PSB BCN-800 is a custom-designed rear enclsoure and back box for PSB's CS800 Series in-ceiling loudspeakers - including the CS805, CS810, and CS850. The back box requires a round cutout measuring 9.75" (diameter) x 5.625" (depth). The back box provides a speaker pass-through connection with spring-post terminals on the outside of the box to connect your in-ceiling speaker wire and bare wire inside the box to connect to the spring-post terminals of the PSB CS800 Series speaker.