On 05/16/2012 08:00 PM, Chris Caudle wrote:
Well, neither the UA25, nor the Behringer speakers nor the ASUS screen
are high quality devices. They're OK for home-use and actually pretty
good for their price, but I judging by the ground-loop noise, at least
one of them is improperly designed :)
Note that the UA25-EX (successor of the UA25) features a ground-lift
switch which disconnects the sleeve pin of the master output from the
>> /me is pondering to cut the ground-wire from the screen..
> From: Robin Gareus
They were TRS<->TRS. I've just replaced them with balanced TRS<->XLR
cables and the problem went away.
Actually I previously tried that but I did not pay attention: I was
using an unbalanced (mono TRS jack - bridged the shield and ground)
TRS->XLS cable - which of course did not help.
> Which of the equipment (video monitor, computer, active speakers) have
All of them are grounded (I live in Europe). The power-supply is built
into the screen and the speakers. Only the laptop has an external PS
(also grounded) and a 2 pin low-voltage connection to the laptop, but
that does not make a difference - the noise was there when running it
from battery, too.
> Equipment in the US is typically
I don't know about regulations, but non-grounded equipment is becoming
extremely rare here. Basically only some external PS units for phones,
etc are not-grounded, everything else is.
> I ask because you need to give the ground current someplace to flow to
That's a neat tip. I remember that from old record-player days, but
would not have thought of that in the current context.
> Something like one of these would probably help:
Thanks for all the information and feedback. Might come in handy one day.
For now I took the easy way out and just got myself two new cables :)
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