Going faster tightens that pressure wave cone, but there are a lot of other factors too. Vehicle geometry seems to be a pretty dominating factor for example, longer aircraft have less severe sonic booms. Depending on the shape of your aircraft you may or may not get several shockwaves originating from different points that after a distance combine to form a larger shockwave. Altitude is a biggie too, the higher you are the less intense it will be.
Going faster tightens that pressure wave cone, but there are a lot of other factors too. Vehicle geometry seems to be a pretty dominating factor for example, longer aircraft have less severe sonic booms. Depending on the shape of your aircraft you may or may not get several shockwaves originating from different points that after a distance combine to form a larger shockwave. Altitude is a biggie too, the higher you are the less intense it will be.
Take note of how the F-104 and Concorde compare (http://en.wikipedia.org/wiki/Sonic_boom#Measurement_and_exam...). The F-104 moves slightly slower, slightly lower, but has a much weaker sonic boom.