I have been an Ampeg player for years and get an Aguilar cab from another TB'er in trade to try it out. Where does the growl come from? No matter what head I use with the cab it just sounds great for rock. I know speakers can be "tuned" to point and so can cabs but wow. I just traded off my SWR head to get a Gallien Krueger head for this cab (always liked GK for rock). I just got my Music Man SUB 4 as well and I am in tone heaven. Are there any other users on here that use the GS410 for rock? I think I have found the one.