Have lots of batteries, and a H.O. alt and that amp will do .5 all day long. I have dropped the d5000, d1200, and d2400's to .5 or lower for daily in many vehicles. If you got any questions email me, I don't get on here real often, but I did a lot of playing with these amps.
I haven't had the chance to play with the d600 yet, but I would bet it will do .5 also. I know orion is still having problems with the d2400 shipping and being ready for production. One of the two I got in November the thermal protection didn't work right and the amp cooked itself. Just kept getting hot and bubbled the fuses. One of the two I got still works. Sooner or later their build house will get there act together. Other than that, great amps, do great power and take low loads all day, with enough current and voltage behind it.