Yorkville C110 Coliseum Series Compact 40W Installation Loudspeaker - 5"The Coliseum C110 is a high quality, weather resistant speaker, which features specially treated drivers in a rugged ABS plastic enclosure. It is well suited for many applications including commercial installations, home theaters, home stereos, reference monitors and personal stage monitors. The C110 is a bass reflex enclosure with a tuned port and a 5" woofer whose computer optimized design gives improved bass performance over conventional 5" woofer