I think someone already fielded this question but yes, the BM's and the Mag's are XBL^2 equipped. //content.invisioncic.com/y282845/emoticons/veryhappy.gif.fec4fed33b4a1279cf10bdd45a039dae.gif
We've got the Mag equipped with a copper anodized pole piece (anodized first and then diamond CNC'd down to the correct diameter), so along with all the benefits that XBL^2 alone offers we got the inductance down to 0.8 mH on the new Mag. Transient response is great - as Jim and Chad will attest, and the low end is better than the current Mag. No joke, the new Mag has more, cleaner, low end output in 1 cube sealed than the current Mag does in 2 cubes sealed.
The BM's have an aluminum shorting ring in the rebate, which lowers the inductance quite a bit over the first FEA analysis.
So both new drivers from SI have shorting rings in them. They are different due to one factor really - cost. We spared very little with the new Mag - hence the copper anodized pole piece instead of a copper sleeve. Copper sleeves have air gaps, where as anodization doesn't. The BM's shorting ring works really well and saves on cost compared to what we did on the Mag. Oh, and for people who are actually reading these pages, another cool thing about the new BM's is that they have a 10" spider on them and a cone glue joint area equivalent to a 5" flat circle. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
In the end both drivers have low inductance, stable BL motors. What that means to you (any customer) is cleaner, tighter, deeper, more consistent bass.
Oh yeah, I almost forgot about why I started to post - I think HHawk might be the first person to order a Mag after I open up ordering. There are a lot of people waiting to order, and he's hot on the trail to order a trio of Mag 12's to put in his Lexus. I want a few too, but he might get them before I do!! //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif