I am still trying to figure out what the hell you guys are talking about? Maybe I am so deaf after 32 years of shooting that this "noise" doesn't bother me? Just get some Bias ply Swampers and you'll probably never hear this noise again!
Only pressure boom I have ever experienced was in the back seat of an F-14 Tomcat! Mach 1.4!!!!!!!!!!!!!!!!:sun: