Let me chime in to also highly recommend the isoloation transformer option. Smaller capacity, say 500va ones are very inexpensive (well, at least inexpensive compared to other 'audio tweaks' that abound).
I've picked up a few off ebay, such that I now have my whole system running through several of them. I look for at least 1,000va ratings so i can run amps through them too. The transformer is massive, which i normally find to be a good thing.
Also, I find shielded power cables to be a big plus on digital equipment. I use a Bluesound node streamer, it has an uncommon power input jack. I found a corresponding plug and made a power cable with some shielded 16 gauge cable. A noticeable improvement over the stock cable. After that experiment, i did similar on my Dac and digital eq.
I've picked up a few off ebay, such that I now have my whole system running through several of them. I look for at least 1,000va ratings so i can run amps through them too. The transformer is massive, which i normally find to be a good thing.
Also, I find shielded power cables to be a big plus on digital equipment. I use a Bluesound node streamer, it has an uncommon power input jack. I found a corresponding plug and made a power cable with some shielded 16 gauge cable. A noticeable improvement over the stock cable. After that experiment, i did similar on my Dac and digital eq.