Bogen round recessed ceiling speaker enclosure- Protective enclosure for an 8' cone-type loudspeakers- Designed for recessed installations and for use with any of the Bogen ceiling grilles- One-piece steel construction includes a mounting ring and a foam insert to reduce metallic resonance- Finished in rust-resistant black primer and is tapered for easy stacking- UL approved- 4 Combination 1/2' x 3/4' conduit knockouts provided at 90 degree intervalsBGRE84