The third step to ensuring optimal sound quality is to troubleshoot common problems that may affect your sound system. Feedback, echo, and noise are some of the most common issues. Feedback is a loud squealing or humming sound that occurs when the sound from the speakers is picked up by the microphones and amplified. To prevent it, you should position your speakers away from your microphones, use directional microphones, lower the volume or the gain of your sound system, and use equalizers to cut out the frequencies that cause feedback. Echo is the delayed or repeated sound that occurs when the sound from the speakers bounces off the walls or other surfaces of your venue. To reduce it, you should use fewer speakers, place them closer to your audience, and avoid pointing them at reflective surfaces. Additionally, acoustic treatments such as curtains, carpets, or panels can be used to absorb the sound and improve the acoustics of your venue. Noise is any unwanted or distracting sound that interferes with your sound system. To minimize noise, you should isolate your sound system from other sources of noise, use shielded cables, avoid crossing or coiling your cables, and use filters or noise gates to remove or reduce noise.