The MB2i is remarkably superior to the IB1S... Mainly due to the midrange it utilizes, and the new solonex tweeter. More effective ATL length makes for a bit deeper bass extension. The IB1 at 25hz and the MB2 at 20hz.
While you could say that the sound just gets bigger as you go up the line - I would like to say the sound is more refined. From the DB1i & GB1i to the TB2i & FB1i the sound is bigger and sepration becomes more apparent, bass extension improved.
From the OB1i to the PB1i to the EB1i - while the they feature the same mid range; power handling and bass extension are substantially improved across all three models, each improving on the prior.
From the the IB2i to the MB2i to the BB5i you will hear the same escalation of performance as that seen in the OB, PB, & EB, except these three models are a whole cut above, the PMC 75mm soft dome mid range and increase in effective ATL length being at the heart of the jump in performance. aa
