interesting article, ep.  years ago, when i was looking to put together a sub system, i also was considering the 10b x-over.  i ended up going w/a marchand xm9-LL instead, & have no regrets.  why?  it's less than half the price, its x-over points are manually adjustable to any walue you choose, 24db/octave slopes, and a wolume pot *at* the chosen x-over frequency, to adjust for anomalies of different speakers.  also - a main consideration for me - was sonic quality.  several folks i spoke with, who were familiar w/both units, said the marchand was at least as transparent, if not more so.  'nuff said.  now, don't get me wrong - i've never auditioned a bryston x-over, & it may be the best there is.  but, i'm way happy w/my marchand, and it's been completely transparent, w/many different speakers i've tried in my rig.  also, w/the aid of a pink noise generator, & a spectrum analyzer, it's quite easy to effect a good blend w/any speaker i've tried...
good luck,
doug s.