There are plenty of good reasons to use an isolation transformer including blocking DC, preventing ground loops and getting a quiet neutral. Of course the biggest variable is the quality of your AC in the first place, which is my case is just dreadful. (The corporate parent of my electric utility has paid tens of millions of dollars in penalties for its bribery and fraud schemes, which only drains money that could be spent to improve local infrastructure.)
Isolation transformer question
I know people who say they have bad power, and want to buy an isolation transformer.
When it comes to audio improvements, what will an isolation transformer do that all of the transformers in your gear aren't already doing?
(I'm not talking about "power conditioners" which include many things like filter capacitors, inductors, and so on)