I built my power cords ( which was not cheap ), and over the years have tried many Dacs ( all under 1K ), and I still enjoy my modified Adcom GDA 700. In my 2nd system, I use an Audio Alchemy DDEV3.0, with a modified power supply. Upgrading your Dac's power supply would increase the dynamics, but, as it is, should have no problem driving the STA 200. Enjoy ! MrD.