James Bang 5,000+ posts
Hand/Ear Coordination
You really should stop comparing speakers that are not released yet. No matter what terms or vocabulary you use, you'll still sound stupid like you do now.The BM should compete with the other shallow mount subs for SQ, the Mag isn't quite a shallow mount design therefore I don't think it is quite fair to compare it to subs like the TW5 or RE SL as they were far more constrained in their design to get the shallow mounting depth. I am not saying either of those sound bad as everyone who has come on here having a TW5 has liked it a lot, and I haven't seen anyone on any forum with the RE SL yet.
As for the BM, based on the XBL^2 motor keeping a linear BL and Le curve as well as a few other features for SQ it should be towards the top of the list for Sq for true shallow mount subs.