John told me that it should take approximately 4 weeks due to the current backlog.
The Titanic sealed with a 1000W amplifier will be louder in the midbass than a single IB15, but with dual IB15, you should have similar midbass, if not slightly more, and much much more low end.
The mains I’m working on building utilize a pair of Usher 8955A drivers per side so I should have very good, low distortion bass response mating up with the IB15s. Since they will be used from about 60hz and down, I think they should do nicely.
Time to order ! 🙂