I use to own a D300 and a D400 MkII, I had a bridging cable made per ARC's specs. But this caused the D300 to run much hotter and was low impendences weren't as forceful. I would really recommend stepping up to a D400 especially the Mk II if you can find one. Truely an outstanding amplifier in the ARC solid states. My D300 was nice but the D400 was much better, and both easily bested the D200.