From Tannoy, the CVS 801S 8" In-Ceiling Subwoofer Loudspeaker pair is designed to deliver exceptional sound in background and foreground sound systems. Suited to commercial and public venues, such as restaurants and hotels, the CVS 801S offers superior power handling, extended bass output, and low distortion. It's UL 1480 certified for fire-protected signaling systems and UL 2043 certified for air-handling spaces.