Sir, yung bang "da bull", better than the dual pb12s in clean output and extention?
hmmm, ang hirap sagutin niyang tanong mo brader. kasi not one room is the same as one another (nor the subs) and i hope you will not take my answer to mean that it is going to be better in your own room.
you see, my learning in the upgrade exercise has brought me to a better appreciation of what total bass management means. and it is beyond just clean output and extension.
but to answer you literally, all the SVS subs i've heard have clean output! as for extension, well DA BULL is way way way way way way way way way way... teka ang layo ko na pala...