Hello,

There was a thread here recently about someone wanting to know if he
could run AV cable alongside mains. Sorry I've lost the thread so I
can't append this to it.

One post said that speaker cable is not screened so would pick up
interference; I'm guessing clicks and clunks from things switching
on/off?

I don't know if this would help but I've been sent a cpc offer leaflet
and there is this twisted speaker cable:
http://cpc.farnell.com/pro-power/jy-.../dp/CBBR631603

I assume it works on he same principle as cat5, telephone cable, etc.
Does anyone know how good it is in practice?

There is also a screened speaker cable in the main catalogue:
http://cpc.farnell.com/image/720001-...0m/dp/CBBR6383

but I think the csa is smaller. It doesn't explicitly say; it says
7/0.2mm. Sorry to be thick: is the 0.2mm the diameter? If so is the
CSA (0.2/2)^2*pi*7 or is it not as simple as that?

Where would the screen be connected? The earth terminal on the amp (as
used by turntables)?

I'm interested in running some speaker cable myself, so would be
interested on advice about the best to use.

HTH
Stephen.

In a domestic environment, speakers are fed from a very low impedance
source and as such pretty immune to picking up 'induced' interference on
the cables. Low level unbalanced cables - as between say pre-amp and amp -
are a different matter. It's good practice not to run them alongside
mains, though, (and in the regs) and to cross any such cable at right
angles.

--
*I wish the buck stopped here. I could use a few.

Dave Plowman London SW
To e-mail, change noise into sound.

In article , Stephen
scribeth thus
Hello,

There was a thread here recently about someone wanting to know if he
could run AV cable alongside mains. Sorry I've lost the thread so I
can't append this to it.

One post said that speaker cable is not screened so would pick up
interference; I'm guessing clicks and clunks from things switching
on/off?

I don't know if this would help but I've been sent a cpc offer leaflet
and there is this twisted speaker cable:
http://cpc.farnell.com/pro-power/jy-...m-transparent-
twisted/dp/CBBR631603

I assume it works on he same principle as cat5, telephone cable, etc.
Does anyone know how good it is in practice?

There is also a screened speaker cable in the main catalogue:
http://cpc.farnell.com/image/720001-...-pair-speaker-
100m/dp/CBBR6383

but I think the csa is smaller. It doesn't explicitly say; it says
7/0.2mm. Sorry to be thick: is the 0.2mm the diameter? If so is the
CSA (0.2/2)^2*pi*7 or is it not as simple as that?

Where would the screen be connected? The earth terminal on the amp (as
used by turntables)?

I'm interested in running some speaker cable myself, so would be
interested on advice about the best to use.

HTH
Stephen.

After years working in Recording and Radio stallions and at home I've
yet to have a problem with this sort of thing, the only proviso is that
the equipment is of good design and quality...

--
Tony Sayer

In article ,
tony sayer wrote:
After years working in Recording and Radio stallions and at home I've
yet to have a problem with this sort of thing, the only proviso is that
the equipment is of good design and quality...

To be fair, all such cables are well separated from mains in a studio
installation. For safety reasons.

--
*Why do we say something is out of whack? What is a whack?

Dave Plowman London SW
To e-mail, change noise into sound.

On Dec 4, 11:02*am, "Dave Plowman (News)"
wrote:
In a domestic environment, speakers are fed from a very low impedance
source and as such pretty immune to picking up 'induced' interference on
the cables. Low level unbalanced cables - as between say pre-amp and amp -
are a different matter. It's good practice not to run them alongside
mains, though, (and in the regs) and to cross any such cable at right
angles.


It depends entirely on what's being sent down the speaker cable. If
its powering a standard speaker, then capacitive or inductive pick up
is a total non-issue. Signal level is high, and impedance very low.


NT

Bit of a coincidence, but I've just come back from sorting out a friend's
audio problems. He had linked an amp downstairs with one upstairs (tape
out to aux in) using thin car speaker flex - figure of eight stuff. With
the ends of phono leads twisted to it and insulated with parcel tape. It
had stopped working (a channel at a time) - although he did say it once
worked perfectly.

So I remade things with phonos soldered to the speaker cable. Not
expecting it to work properly. But it did - not a hint of hum or buzz,
even with no signal.

--
*Gargling is a good way to see if your throat leaks.

Dave Plowman London SW
To e-mail, change noise into sound.

On 2010-12-04 10:49:30 +0000, Stephen said:

Hello,

There was a thread here recently about someone wanting to know if he
could run AV cable alongside mains. Sorry I've lost the thread so I
can't append this to it.

One post said that speaker cable is not screened so would pick up
interference; I'm guessing clicks and clunks from things switching
on/off?

I don't know if this would help but I've been sent a cpc offer leaflet
and there is this twisted speaker cable:
http://cpc.farnell.com/pro-power/jy-.../dp/CBBR631603

I

assume it works on he same principle as cat5, telephone cable, etc.
Does anyone know how good it is in practice?

There is also a screened speaker cable in the main catalogue:
http://cpc.farnell.com/image/720001-...0m/dp/CBBR6383

but

I think the csa is smaller. It doesn't explicitly say; it says
7/0.2mm. Sorry to be thick: is the 0.2mm the diameter? If so is the
CSA (0.2/2)^2*pi*7 or is it not as simple as that?

Where would the screen be connected? The earth terminal on the amp (as
used by turntables)?

I'm interested in running some speaker cable myself, so would be
interested on advice about the best to use.

HTH
Stephen.

May have been my thread, but I didn't want to separate data and mains
cable to avoid interference, I wanted to know how I could meet the
requirements of the 17th wiring regs by keeping data and mains
separated but within the same backbox. The requirement being there to
avoid accidently getting mains voltage in the data cable.

In article , Dave Plowman (News)
scribeth thus
In article ,
tony sayer wrote:
After years working in Recording and Radio stallions and at home I've
yet to have a problem with this sort of thing, the only proviso is that
the equipment is of good design and quality...

To be fair, all such cables are well separated from mains in a studio
installation. For safety reasons.



Should be separated .. often not;!...
--
Tony Sayer