the SDS is more a voltage regulator. It is a MUST on the Scout/Scoutmaster/AriesIII/HRX because of the motor. That is my experience. With the Classic it was never an issue, but I always had the APC on with in the system, so that could be the determinite.
The APC does filtration, conditioning, voltage regulation, and backs up the power with a batter as well for easy shut down if the power goes off. It made a HUGE difference in my system the day I put it in, I really couldn't believe the difference. I have never had any other power components effect sound, really at all. This made a huge difference, and they are not expensive at all. If they are available for your country's system, consider replacing the Shuyunta as I did. I also had Richard Gray, Panamax, Monster Power, several PS Audio's (not the new Power Plant Primier though, which I have heard is great).
Good luck and enjoy the new deck.
PS - if you happen to be in the south of France, or Tuscany I will come help you set up, even if you don't need it!!
The APC does filtration, conditioning, voltage regulation, and backs up the power with a batter as well for easy shut down if the power goes off. It made a HUGE difference in my system the day I put it in, I really couldn't believe the difference. I have never had any other power components effect sound, really at all. This made a huge difference, and they are not expensive at all. If they are available for your country's system, consider replacing the Shuyunta as I did. I also had Richard Gray, Panamax, Monster Power, several PS Audio's (not the new Power Plant Primier though, which I have heard is great).
Good luck and enjoy the new deck.
PS - if you happen to be in the south of France, or Tuscany I will come help you set up, even if you don't need it!!