The following was originally posted in the Church Soundguy blog:
Some time ago, I posted an article on how to ring out a sound system: how to use your ears and an equalizer to minimize feedback and maximize system gain. If you’re not using an automated EQ, then this is one of the most important things you can learn.
This video explains the process, and shows how to use a spectrum analyzer in the process. If you set up portable systems, you probably need this video. The information is from Bill Gibson’s book, The Ultimate Church Sound Operator’s Handbook.