That is one sexy beast! I just love the way it looks. It looks like a Monolith. You can tell it means business and that cab looks super inert. I almost talked myself into getting one, but as fate would have it, that RBH 1212NR fell in my lap while I was contemplating it. I even started a thread with an image of your sub in the op!
View attachment 48204
Well, fell in my lap as in I was scouring the classifieds for subwoofers, found it, threw my money at the seller and raced home with it, lol. It's funny tho because it's a similar design and just happened to pop up when I was looking at the Monolith. It doesn't dig quite as deep, but with the right amp I think it'll match output.