The problem with using WinISD for apps like this is that it doesn't take into account vehicle transfer function very well...so you're going to get a lot of low end reinforcement that doesn't show up on that graph.
That graph also looks peaky as hell, but that may be what you're after...//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif