Hi, I am trying to hook up a Motu 828mk2 firewire soundcard to my 2010 Mac pro. The Motu has 6 pin firewire 400 ports while the mac pro has 9 pin firewire 600 ports. The Motu has its own ac adaptor for power. I don't want any chance of more power being sent to it via the firewire bus when I hook it up. Any way to disable firewire bus power through OSX? Also, there may be a chance I have nothing to worry about here, because the Motu is not suppose to be "bus powered" in the first place and requires the ac adaptor at all times, will the design of the device not "accept" any firewire bus power the mac pro will give it? or does it not work this way with firewire devices and they will get any firewire bus power available, just in some cases they require more through an adaptor?