If music were the driver, an identical speaker, as suggested by Kal, is the way to go. I say go all the way...surround speakers also.
However, if it is just for dialog in movies, a speaker optimized for dialog is best. Such a speaker will have limited and non-flat frequency response.
However, if it is just for dialog in movies, a speaker optimized for dialog is best. Such a speaker will have limited and non-flat frequency response.