Walt, Lang and other Mac users,
I haven't yet been able to find out if the Mac G5 'tweeting' problem applie=
s
only to the built-in sound port. Maybe it applies only to the sound output=
.
The available information has not been clear on this.
My friend in the UK has said this:
<It is interesting that the Naturerecordists have not heard of the problem
with the G5s. There was one article in the UK Macworld, May 2004, p 20,
entitled "G5s are creating a real buzz", and one in the May 2004 edition of
Sound on Sound magazine, which I get occasionally, on p 266, entitled "Worm
in the Apple?" It has also been discussed on Apple's forum pages,
apparently. Macworld picked it up from a memo to suppliers. It only
happens with dual processors, and may be due to the power supply =AD the
single processors use a different supply. However, some users have still
got the problem with the new power supplies, so that may be only part of th=
e
problem. They describe the noise as a buzz or high pitched chirp, so
unlikely to be due to ground loops, as suggested by Apple. It happens when
the processor changes power use, so may be solved by setting processor to
work at "highest" in the energy saving system, but this increases fan noise=
,
which is considerable. The, presumably digital, sound may be transmitted t=
o
external audio devices connected by any method, but it is not clear if it i=
s
transmitted to sound recorded on CD. One article suggests the problem will
not occur with future models, but I think I would want to do a lot of
research on that. Since it probably is a problem only to people who record
sound, it may not be widely publicised, so I thought it was worth knowing
about.>
So perhaps the Mac forum (presumably on the internet) would be the place to
find out more? Sorry that my information is rather vague but it's the best
I can manage. If anyone can find out more, please let us all know!
Vicki Powys
Australia
on 27/4/04 1:35 PM, Walter Knapp at wrote:
> From: Vicki Powys <>
>>
>>
>> A friend of mine in UK has told me that there have been some warnings in
>> magazines there about the dual processor G5 computers. Seems they put
>> tweeting noises into recorded tracks when the processor is not running a=
t
>> full speed. Apple thought it was the power supply problem and offered t=
o
>> replace units but apparently this does not always cure the problem.
>>
>> So if anyone is thinking of upgrading their Macs, take heed!
>
> I would suspect this would only apply if using the built in sound input.
> Something like a USB interface, like I use should be fine, particularly
> in my case where the digital data is actually generated by the
> Portadisc. Even analog input into the Roland I use should be fine. I
> also use the roland for my output conversion to analog, don't use the
> built in at all anymore. A single in and out path was pretty limiting.
>
> Note that such problems occurred if the wrong input protocol was chosen
> in a G4 as well. If such a problem occurs try the various protocols and
> see if one of them works. Same thing applies if persistent clicking is
> noticed in the recorded input.
>
> I'm still not ready to buy a G5, still waiting for all the bugs to
> appear. I suppose this may be one. I'll wait at least another generation
> of G5's. Maybe longer.
>
> One question, does this also apply to the built in optical digital audio
> input? Or is this just the analog one.
>
> Walt
>
>
>
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