Sorry, but I never did an A/B test for volume. Off the cuff I wouldn't say there is a significant difference as both were always 'loud enough.' However, I do agree that two fifteens probably wouldn't have the same output as a 4x12.
That was my impression, but would you say that with 2 OBC115s you could get enough volume for medium sized gigs? I'd really like to go with them instead of the bulkier 412.
