Ka-Boom 1.5 is a fan-made mashup rather than an official in-game clip, combining explosive sound design from Call of Duty: Black Ops 2 and Call of Duty: Black Ops 4 into a single custom effect. Its name reflects that combined, amplified feel, and the 1.5 label distinguishes this version from other Ka-Boom edits shared online. It has found a second life on soundboards, where Call of Duty players and video editors reuse it for montages, reaction clips and highlight reels because the familiar franchise audio instantly signals a big, chaotic moment.