never had a type-r, i know they can get loud with the right power. but i do own a 12" lethal injection, and it compares to my FI Q I previously had. only needs 600rms to hit hard, and i am giving mine 700-750rms (give or take) and its insanely loud off that kind of power. and people who say there is no such thing as sql, so i will say its gets extremely loud and sounds very clear and good doing so.
check out my review in the sub review section, i have vids and a very detailed review.
also there having an insane sale right now, i think 20% off all lethal injection subs for a limited time. so if your looking at the lethal injection, right now is the best time to buy one.