No it should not be on topic, because there is a big resource online already for this type of questions. Sound Design however does not have this big presence(besides a defunct mailing list on yahoo and some generalities on filmsound.org).
Furthermore the questions so far are on a very basic level, compared to the sound design questions. Of course sound reinforcement is a sound field that has mutual technical issues as sound design, however it never becomes an artistic issue (so far).
The focus of this website is blurred, with possibly any question regarding sound 'on topic'. This makes it an open invite to one stop shoppers that only drop a question here (and elsewhere) but don't help build the community. Having sound design and sound reinforcement together turns out to not exactly be helping getting a focus, it seems to me.