I love this story about how shofar can change spiritual energy. It is from Pastor Beni Johnson, who also displays this image of the shofar on her website.
...I believe that the shofar, used the right way, can be a powerful weapon in prophetic intercession. The sound that the shofar produces can cause a change in the spirit realm, which in turn changes our physical realm...Several years ago, I was talking with one of our seers. (A seer is one who has the ability or gift of seeing into the spirit realm.) We were talking about the prayer house. There had been some strange ungodly happenings going on around the house. She told me that there was an illegal communication line going into the prayer house. Obviously, this was something that was not legal and needed to be taken care of. I knew I needed to pray and get God’s solution to this intrusion. As I asked God, I felt like I was to take the shofar to the prayer house and blow it there.So I went early one morning with a friend, and when the sun came up, I blew the shofar. That is all I did. I didn’t pray. This was the first time I had ever used the shofar. I really have no idea why. I had never been a fan of blowing the shofar. Someone had given me one and I thought they were cool, but didn’t think I would use it for anything. But little did I know?. Because of the strange happenings going on and our prayer house being open 24/7, we had brought on security staff to watch over the place.So, after I blew the shofar that day, I waited a week and went to our security guy and asked him how the week had gone at the house. He did not know that we had blown the shofar the week before. His response to me was, “You know, the strangest thing happened this week. There was no weirdness. It all has left.”I was so excited and I knew that the sound of the shofar had released the sound of heaven that displaced the evil intent. Since then, we have used the shofar from time to time to release a sound into the atmosphere. Just like in the declarations that we pray, the same power that is released when we declare is the same power that is released in sound. God’s first language is not English, nor does he just use words to fulfill His will. That is the adventure of serving Him. Listen for His voice and be a releaser of the sounds of heaven!