sudden loud thunder noise from speaker

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Hi all ;

I am having a severe problem with my peavey PA system.
After I connected all the system components together, the PA system was left on;
A loud continuous noise of distortion started coming out of the single speaker I connected. It was so loud people actually ran away thought it was a noise of thunderstorm.
I asked some local experts, they even didn’t know which part of the whole PA system is responsible for that. Either it’s the cables, the amplifier or the speaker which is faulty.
Some say it’s the wireless mics that causes the speaker to do that.

This catastrophe happens once in a while .
Does any one know what causing this, and how to eradicate this problem ???
Please help. I am new at this job.

My gear :

PVi 8b
(150 watts / 4 ohms)
Peavey.com ... 6nbsp%3B8B

Speaker :
peavy PV 115
(8 ohms)
Peavey.com ... nbsp%3B115

Wireless microphones :
sennheiser ew 100 G3

Cables :
Prolink. performer 500. Monster cable


is the combination of speaker and amplifier technically correct ??
cuz the amplifier is 150 watts and the speaker is 400 watts.

or is this happening cuz i am connecting only one speaker instead of 2 ???

please help

sincerely
jack
( yes. i am newbie in audio)
 
Has nothing to do with one or two speakers. When you use only one speaker, the amplifier doesn't have to work as hard. It is easier on the amp.

Let's isolate the problem. It won't be the speakers or the speaker cords, so it will either be the amplifier/mixer itself, or it will be a wireless or other input.

On the lower right are three controls for effects, where are they set now? Turn them all to zero, any different?

There are five graphic equalizer sliders, upper right. slide them all to the bottom. Does that turn down the noise or leave it unaffected?

You think it might be a wireless? OK, then unplug ALL th wireless or other inputs to the eight channel inputs. Does the system now make the noise with no inputs connected?

So first turn the master volume to zero. Does the noise stay? If it does, the mixer power amp is noisy. If zeroing the master kills the noise, the noise is before that. Now turn ALL the controls to zero. Then turn the master volume ONLY back up to midway. Noise or not?

If there is no noise yet, then turn up the channel volume for each input channel. Do this one at a time for the eight channels. We are looking to see if one channel is noisy.

SO far we have tried to narrow the problem down to one section of the mixer. But if the mixer comes up innocent, then we look to your inputs. Start by plugging just one wireless into an input channel and turning up the levels to hear. IS it noisy now? Make sure the wireless receiver and transmitter are both on for the test. If you have more than one wireless, try each by itself. If you use any other inputs besides wireless, try them one at a time as well.

Chances are your mixer has developed a noisy part.
 
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