So I play the guitar, and I cannot use the same amp I use to gig with, because in my home basement, it's too sharp and trebly; the high frequencies sound way too apparent. Guitarists refer to this sound as an "icepick rammed into both ears". In the two venues I used to play at most often, I could NEVER get a sound that was too sharp. Furthermore, my amp sounded much louder in those venues compared to my basement. I used to think it was because the those rooms were huge compared to the rooms in my house. But now I think it has a lot to do with the shape of the venues as well; the venues were both rectangular/square shaped. My basement is in the shape of one of those composite figures; if you can imagine, it's basically a rectangle, with another rectangle jutting out of the longer side of the first rectangle. So now I think about it this way: 1) my basement is tiny, and 2) it is not in the shape of a professional venue/room. Therefore, the reflections of the sound coming from the amp, bouncing back from the walls, makes it so that my guitar is not very pleasing to the ears. Am I thinking wrong? Can someone give me a detailed scientific explanation as to why it is how it is?