I just did and I don't see Voltage listed as a spec on any of the fans at newegg.com. except for that one that is 48V that everyone hates because it was mis-labeled at first.
I did check my fans manufacturer site and it does say start voltage at 6V, 12V rated. 10 Volts should still be enough, just have to hook all fans on the controller circuitry in parallel to give them 10V a piece.
P.S. Thanks I though those fans were on a 5V rail.