[MPA] Sound Problem in 10.3.8

[Jay Shaffer]

Definitely get rid of that RCA cable.
A good article on ground loops is available at: 
http://www.epanorama.net/documents/groundloop/index.html
Also UPSs can be problematic. (Big transformers, sine wave clipping and 
floating grounds.) maybe look at a power conditioner instead.
--
Jay Shaffer
Mac Audio Guy
Author of "The MacAddict Guide to Making Music with GarageBand"
mag at jayshaffer.com
http://macaudioguy.com/

On Mar 8, 2005, at 3:37 AM, David DelMonte wrote:

> Gregg, I think it did fix the problem  - but it is not fully 
> satisfying. Yes, everything is plugged into the same outlet - in fact 
> - to a UPS device (APC). But I also had to wiggle the audio cable 
> (RCA) in order to get the buzz to stop.
>
> Can you please explain a little about how a ground loop happens?
>
> David
>
> ps. I of course swapped audio cables. same experience.
>
> On Mar 8, 2005, at 3:51 AM, Gregg Gorrie wrote:
>
>> on 3/7/05 3:27 PM, Carol Stein at carol at carolstein.com wrote:
>>
>>> Thanks for taking the time to answer. I will check out the  circuit
>>> situation
>>> Carol
>>>
>>
>>>> It sounds like what you're experiencing is a ground loop. Make sure
>>>> that
>>>> everything in your computer system and your audio chain (interface,
>>>> mixer,
>>>> etc.) is using the same A.C. electrical circuit ... use one or more
>>>> power
>>>> bars if needed and have them all going to one plug-in at the end.
>>>>
>>>> Alternatively, if the M-Audio interface or any of your other audio
>>>> equipment
>>>> has a ground lift switch, lift the ground to see if that solves the
>>>> problem.
>>>> -- 
>>>> Gregg
>>
>> No problem. Please let me know if this fixes your problem (both you 
>> and
>> David).
>>
>> Carol, this solution should also include all of your video equipment 
>> (ie
>> camera, monitor, etc.) as well as the audio and computer equipment.
>>
>> -- 
>> Gregg
>>
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>
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