I am a female audiophile.
As to why there are so few ... I'm not sure myself, but the simple fact that the field is so heavily dominated by men is one reason, I think. Women are very aware of where they are not welcome, or where they MAY not be welcome, or where they may be denigrated, talked down to, patronized, or in other ways made to feel different or "other". Think of how people of color have to worry about being put down or subtly denigrated in situations where they are in the distinct minority. It's the same kind of dynamic at work.
As to why there are so few ... I'm not sure myself, but the simple fact that the field is so heavily dominated by men is one reason, I think. Women are very aware of where they are not welcome, or where they MAY not be welcome, or where they may be denigrated, talked down to, patronized, or in other ways made to feel different or "other". Think of how people of color have to worry about being put down or subtly denigrated in situations where they are in the distinct minority. It's the same kind of dynamic at work.