Which 2011 Mac Mini USB port are you using?

I have a new 2011 Mac Mini (w/Lion). My hard drive is connected via firewire. I use port 1 (the one closest to the power button) to use for an output to my usb to s/pdif converter. I turned off the infrared receiver shared on the bus.
Before I start switching things all around, has anyone found that a different port sounds better?