Courtesy Wikepedia:
Nerd is a term often bearing a derogatory connotation or stereotype, that refers to a person who passionately pursues intellectual activities, esoteric knowledge, or other obscure interests that are age-inappropriate rather than engaging in more social or popular activities. Therefore, a nerd is often excluded from physical activity and considered a loner by peers, or will tend to associate with like-minded people.
The word geek is a slang term, noting individuals as "a peculiar or otherwise odd person, especially one who is perceived to be overly obsessed with one or more things including those of intellectuality, electronics, etc."[1] Formerly, the term referred to a carnival performer often billed as a wild man whose act usually includes biting the head off a live chicken, bat, snake or bugs.
I think we audiophiles fall in the "geek" category. The ''overly obsessed with electronics" describes us exactly.