From Tannoy, the CVS 801S LZ 8" In-Ceiling Subwoofer pair is an 8-ohm, low-impedance set 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 LZ 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.