so many always people talk about setting up a "studio" (for audio production)
but few of them bother to think about speakers.
whatever else is used I would think having some decent speakers is the most important thing.
In this context by "decent" I just mean reasonably accurate, smooth rollof/etc
If you are doing any kind of music production you would want to be able to hear what you are are doing and not be guessing too much about any idiosyncratic colouration or eq in your listening setup.