Buy a power strip that has an on/off switch and plug all non audio stuff in it. When listening to music, turn it off. Then, experiment with various combinations of strips and splitters for the best sound. I would start out with the digital stuff on something with a filter and the analogue items in the other socket without filtering.
I'm not exactly sure about this but I think you can have battery supplies made to power your cd player, pre and phono. I have always been given good reasonable advice from Chris Hoff at BPT (http://www.b-p-t.com). He could tell you about battery power supply possibilities among other solutions.
I'm not exactly sure about this but I think you can have battery supplies made to power your cd player, pre and phono. I have always been given good reasonable advice from Chris Hoff at BPT (http://www.b-p-t.com). He could tell you about battery power supply possibilities among other solutions.