i.e. Sub Woofers, Speakers, etc. In short I need to know how much energy you're putting into your room and this will indicate to me the frequencies involved. If you don't know, then leave this part.
Do you have any cavities in your room, i.e. a bay window or fire place? Are there windows in your room? If so where and of what dimensions? Also what is the room used for, i.e control room, listening room, home theater. Finally, please if possible include your phone number so that Dennis can call you should he have any follow up questions for you when running the analysis.