Let's briefly discuss a few issues and possible solutions if you are getting a distorted signal from your speakers. Some basic issues are just that, basic. To keep things simple here we won't use engineer talk but use easy to understand language. A common cause of distortion is signal overload. If you are pushing your equipment to produce a signal level that it is incapable of producing you will get distortion. This can be damaging to your equipment. If you are forcing your speakers to output more than they are capable of then you risk damaging your loudspeakers. A quick fix can be to reduce your signal level. The usual solution is to add more speakers to spread the load required by your loud speakers, although this is not the most practical idea if you're halfway through your gig and all the shops are shut.
Another possibility is that you are sending frequencies to your loudspeaker that they are incapable of reproducing, or possibly extremes in frequency of signal, IE: ultra high and ultra low.
A third probable cause of distorted or corrupted signal can be the equipment itself. Poorly maintained equipment may not be able to effectively produce good output sound. There's a whole bunch of mechanical issues that can cause problems but here's some things to look out for and fix - loosely mounted components, loose screws and handles, damaged casing, glues and soldering issues, welding issues, and poorly constructed frames. Most of these issues can be fairly easily fixed but may take a bit of skill and effort. Prevention is better than cure so it's a great idea to frequently go over your equipment, look for possible issues, and fix them before they become a problem.
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