Another possibility is the university complex itself is the source. There are probably large motors for air condioning and elevators, some of which may be variable frequency drive, that puts noise in the power grid. Another possibility is that the university has a cogeneration plant - generating electricity to the site and selling some power back to the utility. This backfeed will also put noise in the line. In short, that facility may be the culprit and not the substation. Your only solution may be a shielded isolation transformer for the whole house (way too expensive) or for the audio circuits. The xfmr should be grounded at its location.
Also, power quality is an issue that your utility has to address. Whether it's voltage variations (sags and dips) or noise, they are required to have a means of hearing your complaints and to make a good faith attempt to correct these issues. Let them know - maybe they think everyone is happy as they send out their bills.
As a side note, a friend has an office directly across the street from a utility small-scale generating plant. There is no problem with AM or TV reception. The only noticable effect is when you drive only past the front gate and the AM in the car briefly hums out.
Also, power quality is an issue that your utility has to address. Whether it's voltage variations (sags and dips) or noise, they are required to have a means of hearing your complaints and to make a good faith attempt to correct these issues. Let them know - maybe they think everyone is happy as they send out their bills.
As a side note, a friend has an office directly across the street from a utility small-scale generating plant. There is no problem with AM or TV reception. The only noticable effect is when you drive only past the front gate and the AM in the car briefly hums out.