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A sonic boom is the sound produced when an object breaks the sound barrier i.e when it travels faster than the speed of sound. When a body travels below the speed of sound (subsonic), the sound emitted by it travels in all directions.
The sound source is travelling at 1.4 times the speed of sound (Mach 1.4). Since the source is moving faster than the sound waves it creates, it leads the advancing wavefront. A sonic boom produced by an aircraft moving at M=2.92, calculated from the cone angle of 20 degrees. An observer hears nothing until the shock wave, on the edges of the cone, crosses their location.