[jackoneil]

Hi all ;

I am having a severe problem with my 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)

Speaker :
peavy PV 115
(8 ohms)

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)

 

[commsysman]

Hi all ;

I am having a severe problem with my 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)

Speaker :
peavy PV 115
(8 ohms)

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)

It is probably a bad ground connection in one of your signal cables.

Disconnect the cable from the amplifier input and see what happens.

If that stops it, experiment with different cables.

 

[esmugala]

^ what he said

 

[DonH50]

Be sure to power off the system before changing cables...

 

[bluewizard]

It sounds like you are on the other end of the spectrum for feedback. In this case, rather than the typical high-pitched microphone feedback, you got RUMBLE, which is low frequency feedback.

As other have indicated, you need to check all your ground and signal connections, and wires and connectors to make sure they aren't faulty. It is possible that a bad ground introduced some hum, and the hum just built on itself into a feedback loop.

But, the first line of attack is the connections and cables. Now, it could be a faulty cable, or it could have simply been that particular setup at that particular time, depending on how often the system is disassembled and re-assembled. It could be that on this one particular install, a connector was simply not seated properly.

With the system on, with everything connected, but nothing playing, wiggle each cable, start on the end, and move toward the middle, you should hear noise, if you are flexing the section of cable that is faulty. Most often cables will be faulty near the ends, but is is within the realm of possibility that the cable has been damaged in the middle somewhere.

If that doesn't find anything, try rapping on the amp and mics. If they have an internal fault, that might cause it to show up. But ...of course... I said 'rap' not beat; you have to use a little common sense.

If you can't find anything, then likely it was a one time occurrence. Just keep an eye on it.

Steve/bluewizard