I'm currently a new live sound enginneer at our local auditorium. We have a sing TOA series speaker (ugh, mono) that takes a feed from our Mackie 1604 FOH console. We're running it though a TOA amp. The speaker just sounds horrible. I have to apply heavy 12khz shelving on each of the channels to get any highs out of the mix. Recently, I put on a well mixed recording and listened to it throughout the auditorium, with a flat eq from the board. As I moved away from the front center, where the speaker is located, the highs disappeared. The farther I moved away from the speaker, both back and left/right, it sounded more like mush. Obviously, this is a horrible speaker. We do have a graphic eq in our rack which is currently a mess. I would like to acoustically tune the room with a pink noise or sine wave generator and calculate for axial modes, but will the results be worth it? Thanks for your help.