FANE Loudspeakers - Got a Colossus Prime 18XS? why not try building this cabinet design for it? https://www.fane-international.com/downloads/FaneBR18XS-ReflexEnclosure111019.pdf | Facebook
Fane Colossus 18XB-8 Ohm – Thomann United States
Fane Colossus 18 Bass & EV EVX 180B In Free Air Playing Kick Bass - YouTube