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Forum: General Discussion

Topic: speaker hissing issue

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Hi Guys,

Looking for some help again so thanks in advance.

i have noticed recently a rather loud hissing sound coming through my speakers which are JBL 400W I am using a 200W Amp through he Hercules RMX and whilst the music is playing it does of course reduce the almost static sound but its still there. i am presuming i have set up incorrectly any advice?
 
geposted Wed 27 Aug 08 @ 6:45 am
Are you using a laptop? If so try running it on the batteries. If the hissing goes away you have a ground loop issue. Goolge search ground loop isolators.
 
Thanks for taking the time to assist me, i am actually running it from a base PC unit at the moment its only recently this has happened, i understand the concept of ground loop but the power is connected to the same outlet so in theory that shouldn't be an issue but Its just a little problem nagging at me!

Help please!
 
Here is a simple test. use a ground canceller adapter (i think that is what they call them). its one of those connections that make a 3 prong power cord into a 2. They cost about a dollar. connect it to your computer power cord. if the noise goes away you know that was the issues.
 
Bad or lose connection, or cable including power cables. Make sure all connections in the computer are still tight. Can you try another mixer? You say it is the same outlet, maybe it's bad, so try another on. You will have to be a detective to track down the source, but if it just started, there is something different, that has happened.
 
DJ VooDoo wrote :
Here is a simple test. use a ground canceller adapter (i think that is what they call them). its one of those connections that make a 3 prong power cord into a 2. They cost about a dollar. connect it to your computer power cord. if the noise goes away you know that was the issues.


If you do this, then also try it on all components, especially the mixer.
 
Mascherano, have you tried adjusting/reducing master volumes/gains on the mixer and amps.
 
forgot to ask what connections are you using from your rmx to the amp, if your currently using rca from the rmx to quarter jack input on the amp retry just using quarter jack connections between the rmx and amp.
 
I am using speakon to 1/4 jack leads from Speaker to amp then straight forward 1/4 jack to jack from rmx to amp, Ive tried tweaking using gain etc but other than buy another mixer with more sound control options I am limited to the RMX. My amp is a basic 200w power amp its simply got volume. Maybe this is the cause of the problem although I cant imagine why as its such a simple set up and was working fine I only noticed this recently and in my room I have only one speaker set up, I am going to put both on later and see if the distortion continues lower volume two speakers maybe itll fade, although I dread the thought of twice the hissing!!!

I go along with the ground issue and will try and ground loop isolator, question is how does this work using 1/4 inch jacks is there such a connection?

Once again thanks for the help its much appreciated!
 
pop into your local maplin store and tell them your problem and what you require, they are normally quite helpful.
 
A Man and His Music wrote :
DJ VooDoo wrote :
Here is a simple test. use a ground canceller adapter (i think that is what they call them). its one of those connections that make a 3 prong power cord into a 2. They cost about a dollar. connect it to your computer power cord. if the noise goes away you know that was the issues.


If you do this, then also try it on all components, especially the mixer.


Dont forget to chck on your gain, devices that require a +10 db can be tricky with some mixers
 
YEA>>>>> ITS THE GROUND ON THE LAPTOP,,,TOOK ME # WEEKS TO FIGUE OUT
 


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