If you haven't already, please see the following thread for some good discussion and good references about separating ("isolating") the power runs to the different components. There are significant potential downsides, as well as potential upsides, to separating the power runs to different components within the same system.
http://forum.audiogon.com/cgi-bin/fr.pl?htech&1228780109
I would say that the preamp, power amp, and powered subwoofer should be considered to be analog components, because even though they may contain digital circuitry their signal path from input to output is analog. The goal of separating the power runs, should you decide to do that, would be to prevent digital noise generated by digital components from contaminating the analog signal paths.
That said, some people prefer to have separate dedicated runs to the power amplifier, because of its high current requirements. The same consideration would probably also apply to a powered subwoofer, due to its built-in power amplifier.
Good luck!
-- Al
http://forum.audiogon.com/cgi-bin/fr.pl?htech&1228780109
I would say that the preamp, power amp, and powered subwoofer should be considered to be analog components, because even though they may contain digital circuitry their signal path from input to output is analog. The goal of separating the power runs, should you decide to do that, would be to prevent digital noise generated by digital components from contaminating the analog signal paths.
That said, some people prefer to have separate dedicated runs to the power amplifier, because of its high current requirements. The same consideration would probably also apply to a powered subwoofer, due to its built-in power amplifier.
Good luck!
-- Al