I have the DeVore Fidelity Super 8s....they are flat down into the high 30s, so I wouldn't want to cross them over any higher than 50hz or so. Right now I have them crossed over at 60 on my 950 pre/pro, but that's because (I think) the next lowest setting is 40hz, which didn't sound quite as good.
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My Outlaw Journey:
1050 Receiver (2002-2004)
M200 Monoblocks x7 (2003-2008)
7075 Amp
950 PrePro (2003-2010)
975 PrePro (2012-Present)
Outlaw ICs (2003-Present)
M8 Subwoofer (2011-Present)
???