Korg Forums

LBO · Joined: 09 Sep 2007 Posts: 3

When i switch my korg to my powermixer ( i've tried with 3 different ones,so the problem is not from the mixer) there is a very strange noise,a very ugly buzz,which remains even when i switch the pa80 off ?! I thought it is from the cable,but when i bought a new one,the problem remains.... The most wierd thing is ,that when i put the headphones,or when the arranger is playing only from his own speakers the sound is as it has to be - with no problems.so the problem is only when i connect it to a power amp...And also,when i switch off the amp,the buzz remains on pa80's speakers

Choros · Posted: Sun Sep 09, 2007 9:45 am Post subject: Re: Strange problem with my pa-80

Hi LBO,

this phenomenon seems to be a ripple pickup coming over the power cords.
Isolating the protection connectors of either the PA80 or
the amps power plug with a thin cellotape should eliminate this ripple pickup.

Best regards

Choros

LBO · Joined: 09 Sep 2007 Posts: 3

I used another plug for the pa-80 and the problem was solved.it might be because of the two computers in the same connection block,some magnetic pulse or something. Choros - thanks for your help,i appreciate it Smile

S0C9 · Posted: Sat Sep 22, 2007 9:36 pm Post subject:

this is what is called "mains hum" and is caused by a "ground-loop".
A ground loop occurs when you plug into two different electrical outlets that are on the same circuit that [should but] do NOT share the same ground.

So the electrical current tries to find a common ground, which usually ends up routing itself thru the path of least resistance.. which causes the hum. The simple solution is to ensure the amp and the PA80 are on the same circuit.

-Steve
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BasariStudios · Posted: Sun Sep 23, 2007 11:36 pm Post subject:

It is the ground loop, i had the same thing with MOTIF ES.
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Choros · Posted: Sun Sep 23, 2007 11:46 pm Post subject:

Thats true. Alternatively you can remove the (0) protection wire
from the inside plugs connector of the devices power cord.
But this should be the solution only at worst cases.
I know from studio owners that this was sporadically necessary.

ginol96 · Posted: Mon Sep 24, 2007 6:16 am Post subject:

Try use DIRECT BOX
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S0C9 · Posted: Wed Sep 26, 2007 1:49 am Post subject: