Well, I never thought the 500 was lacking in volume. I typically play either solo at home, with a jam group or subbing for another band, they are similarly outfitted with...
Guitarist, one of them is running an old all tube Ampeg 120 watt I think 4x12 stack, the other is running an older Fender 2x12 combo, about the same wattage, drums, me on bass, and vocals. With the jam group the vocals run into some old I think probably Peavey PA, everything else is just amps. With the band, the line goes out to the board, and everything through the BLs PA, so the amps are mostly to monitor.
Mind you, the Rumble 500 without an extension cab is only putting out 350 watts, with the extension cab it gets the full 500. PLUS you are moving that much more air due to the greater speaker surface...
I have described it before and will again, it is more or less the same as the 500, just more, it is louder, fuller, and richer sounding at the same main setting.
My style is a bit different from yours though, I am playing mostly classic rock / country / and what I have heard described here as "bro" country, we keep the venue filled with sound, so we are all good...
If you need more volume than this thing can give you, I would think you might want to check with the Navy, I understand they are working on sonic weapons of some sort...
