thanks - some confusion here. I am talking about mid to higher end balanced=
microphone cable, such as some made by Klotz, Van Damme etc & it states, f=
or example:
2 core, balanced pro microphone cable, aluminium braided shield and strande=
d copper cores.
I'm also slightly confused by the comment about the number of wires inside =
the shielding - 2 cores is balanced audio cable, 4 is quad etc, but 2 wires=
(2 cores) is standard for balanced audio.
--- In Magnus Bergsson <fieldrecording.ne=
> wrote:
>
> @Jez. The reason is just that Aliminium is very good material to screen o=
ff
> 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 righ=
t
> 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 =
ask
> > even more why some very high cost cable manufacturers use an aluminium
> > shield !
> >
> >
> > --- In Magnus Bergsson
> > <fieldrecording.net@> 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 wide=
ly
> > > used. That is one of the reason why aluminium is common use for shiel=
ding
> > > in UHF transmitting and receiving technology.
> > > Aluminium is not good for audio signal, so parallel with the aluminiu=
m
> > 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?a=
uthuser=3D0&feat=3Ddirectlink
> > >
> > > I have not notice any electrical noise pollution with this snake, eve=
n
> > > 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 electric=
al
> > > 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
>
>
>
|