Funperson,have you personally heard a Grado hum? Please tell how it was annoying.Alan,do a search of Grado and read a couple posts about the Grado "hum" This has been covered before and all I will say is it is not an issue.With a 1.5mv output it wont exist.If your willing to spend a bit more the Grado Master is killer! They list for $800 but I'm sure you could talk Audio Advisor out of one for $700.Try Sound City also,when I got my Grado they beat Audio Advisors lowest price by 10% Be sure to ask for Joe,he is the only decent sales associate there.