DC offset on input

In my main room I have experimented with a few versions of power distribution .

one is a 208 in ISO transformer to a single 120 volt output .

The transformer is 10kilo watts it feeds everything audio in my room. No tv or non audio related to that room.

This feeds two power regens. One P10 the other is a p5.

My concern is DC offset at the input . Does it matter ?

One thought was to make a common choke. So as its usaelly goes from a phase to neutral do I still need one for this use. I purposely used a 208 in so no neutral is used. Where any audio ones used as far as I know uses a 125 in and out.

Any rhoughts. ? Much appreciated

thanks in advance