Can I use my device with a 4-pin FireWire connection?

Yes! There is no actual performance difference between a 4-pin and a 6-pin FireWire connection, however to use DuaFire, QuataFire 610 or QuataFire XL with a 4-pin FireWire connector on your computer, the interface will not get powered from your computer as a 4-pin FireWire connector does not have the required pins for power supply. This means that you need to use the external power supply for your FireWire audio interface then.