There are other good reasons not to get a smart meter. Is there an advantage to you in getting one? If you can't find one, don't bother. Then you won't have to wonder about it affecting your hi fi.
I am interested in this part of your answer, what are the reasons for not getting one?
I have ignored repeated mails telling me that I have an appointment booked for installation (even though I have not expressed any interest) and it just strikes me that someone is trying too hard to get me to have one.