@Jez. The reason is just that Aliminium is very good material to screen off
all electrical noise pollution in surroundings. If the cable do not have
any parallel copper wire with the shield I would think the cable is made
for something else than audio.
It also depends of how many wires are inside the aluminum shield.
If they are just two I would not use it for balanced audio. If they are
three or four they must be twisted. Then I think the aluminium shield
should be connected to equipment outer case. For this reason John is right
when he say cable with aluminium shield are specially made for fixed
installations.
Magnus
On Thu, Jun 21, 2012 at 8:17 AM, Jez <> wrote:
> **
>
>
> thanks Magnus. When you say its not good for audio signals it makes me as=
k
> even more why some very high cost cable manufacturers use an aluminium
> shield !
>
>
> --- In Magnus Bergsson
> <> wrote:
> >
> > I just know that aluminium is the best material to shield electrical
> noise
> > pollution. It is not only the price of the material why it is so widely
> > used. That is one of the reason why aluminium is common use for shieldi=
ng
> > in UHF transmitting and receiving technology.
> > Aluminium is not good for audio signal, so parallel with the aluminium
> foil
> > should be a copper wire.
> >
> > By the way...
> > I have make a cheap 50 meter stereo snake with Cat6 cable.
> >
> >
> https://picasaweb.google.com/104187345157190691446/Stereo50mCAT6Snake?aut=
huser=3D0&feat=3Ddirectlink
> >
> > I have not notice any electrical noise pollution with this snake, even
> > though it has no shield. Probably because it is mostly used outdoor.
> > Differently twisted pair is also very good technique to shield high
> > frequency.
> > But anyway, I always try to delete or minimize all source of electrical
> > pollutions before it makes a problem to other equipment or humans :-)
> >
> > --
> > Bestu kve=F0jur / Best regards
> > *Magn=FAs Bergsson
> > *Tel: + 354 6162904*
> > *
> > http://fieldrecording.net
>
>
--
Bestu kve=F0jur / Best regards
*Magn=FAs Bergsson
*Tel: + 354 6162904*
*
http://fieldrecording.net
|