Just popped for my second rumble. I have a 30 I use for practice and I just bought the new Rumble 500 to replace my ridiculously big and heavy stack for a gig amp. And since it is so light, I'll use it for rehearsal and get rid of my 55 lb Behringer UlltaBass 1800. I can't believe how close to a tube amp this thing sounds. number, please.