[looneybomber]

Oddly, these parameters are the same as a sealed box driver, except for the Q. The motor will reduce the Q, so a strong motor is antiproductive for a good response in an IB system, where it is a boon in a sealed box system; so yes, it pays to get drivers made specifically for IB systems. They are rare, so will cost a pretty penny. Good luck!

Not necessarily. The AE IB15, has a .7Qts with an fs of 16hz and a VAS in the mid 400L's, however an xmax of 18mm I think. Real nice option and is 125/ea if you buy 4.