Holy ****! I have always been happy with my sm-500 but I read that thread from the other day that linked to Bryan Beller's site and his eq settings for his sm-400 and I decided to try them at a gig tonight. It seriously made my rig sound twice as loud, with perfect balance, and a hefty set of (60 hz) balls. I tweeked them a tad to taste but other than that those settings are boobies. If you have an sm series swr head give them a go.