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[tech] cable shielding
 

offline Drunken Mastah from OPPERKLASSESVIN!!! (Norway) on 2006-03-20 04:56 [#01863698]
Points: 35867 Status: Lurker | Show recordbag



ok, I need a new cable.. approx 3m.. for some reason, 3m
doesn't seem to exist with "consumer brands" (like monster
cable); they only have 2,4 and 4m and such.. however, I
found a cable, but it seems to be not as well shielded as
the monster cables (at approximately the same price,
though), but the guy in the store said that I could add
additional shielding to the cable by wrapping it in aluminum
foil.. however, hifi stores salespersons are often not the
best sources of information for stuff like this, so I need
someone who actually knows electronics and stuff like this,
and I'm hoping there are some here who could tell me if the
clerk knew his shit of if we was just full of said shit...
the way I see it the foil could either help the shielding
or it could amplify the disturbing signals from shit
around the cable, but what do I know?


 

offline Drunken Mastah from OPPERKLASSESVIN!!! (Norway) on 2006-03-20 05:05 [#01863705]
Points: 35867 Status: Lurker | Show recordbag



who are the tech people round here so I know when to
bump, btw? dave_g has some skillz, right?


 

offline Ceri JC from Jefferson City (United States) on 2006-03-20 05:07 [#01863708]
Points: 23533 Status: Moderator | Followup to Drunken Mastah: #01863705 | Show recordbag



Dave tends to lurk and only log in to post in things like
this.


 

offline Taxidermist from Black Grass on 2006-03-20 05:08 [#01863709]
Points: 9958 Status: Lurker



Hmmmm. I don't know. That sounds kind of hair brained to me.
It might work. But why not just buy cheap cable and wrap it
in a shitload of aluminum foil then?

(probly because people don't want a bunch of wires wrapped
in aluminum lying around their pad, because it looks awfull)


 

offline E-man from Rixensart (Belgium) on 2006-03-20 05:08 [#01863710]
Points: 3000 Status: Regular



for 3m if it's a good cable forget about additional
shielding

if it's a shit cable, don't buy it and buy a good cable

seriously =)


 

offline Taxidermist from Black Grass on 2006-03-20 05:11 [#01863716]
Points: 9958 Status: Lurker



I am the kind of person who would rather have that extra
meter, because then if I move things around I might need it
(I have many hundreds of dollars in cables that always get
moved around and rearranged. The most annoying thing is
having to deal with cables that were the right size, then
proved to be too short when you change your settup)


 

offline Drunken Mastah from OPPERKLASSESVIN!!! (Norway) on 2006-03-20 05:27 [#01863727]
Points: 35867 Status: Lurker | Followup to Taxidermist: #01863709 | Show recordbag



yeah, that's what I thought.. it just sounds silly that you
can shield cables by just adding aluminum foil (though, if
you look inside cables, there is quite often a layer of
aluminum (or similar) foil in there)...

e-man: yeah, I really just want to get a good(ish.. monster
will do) cable from the start, but when the 2,4 isn't enough
and the 4 is so expensive just to have an extra 1m adding
"possibility of interference" and shit.. well.. if it would
work to have a 3m cable with just slightly less shielding
and then putting aluminum foil around it would make it just
a little bit better and equal to a 3m monster, it would
definately be worth it having a foil-clad wire hiding behind
the television...


 

offline Drunken Mastah from OPPERKLASSESVIN!!! (Norway) on 2006-03-20 05:31 [#01863728]
Points: 35867 Status: Lurker | Followup to Taxidermist: #01863716 | Show recordbag



oh, yeah, I know.. the cable I'm currently using for this 3m
stretch is two thin ~1,5m cables connected at the middle
(and it thus has an exposed area where they meet even)
because it hasn't been the most critical part of my setup
(turntable to computer.. I haven't had any real use for it
as of yet.. never had to record anything from the turntable
except a few scratches, and with the scratches it didn't
really matter if there was a bit of noise.. however, a need
for recording higher quality sound has arisen), but I'm
pretty sure I'm not going to change this setup for a while
and if I do, I can just get a 4m cable 'cause I'd probably
find a use for the 3m anyway...


 

offline Drunken Mastah from OPPERKLASSESVIN!!! (Norway) on 2006-03-20 05:34 [#01863730]
Points: 35867 Status: Lurker | Show recordbag



oh, btw.. if you make music, I've used the exposed cable for
an interesting effect once.. the cable runs behind my
amplifier.. when the amplifier is on the only "extra noise"
it picks up is there normal electricity hum/static-ish
sound, but if I turn the amp off, it seems like sound going
through the cables to the amp suddenly doesn't have anywhere
to go, and is.. well, I don't know any tech terms, but it
seems like it "piles up" inside the cables and then
ejaculates out through them.. this residue is then picked up
by the cable (most likely the exposed part) as a weird
crackle-distorted version of the signal you're sending.. so
I made a song, played it back with the amp off while
recording from the cable and added the distortion as an
effect.. I haven't finished the song, so it's not uploaded,
but I'll get around to it after I finish the song I started
after it and then people can hear...


 

offline mylittlesister from ...wherever (United Kingdom) on 2006-03-20 06:56 [#01863761]
Points: 8472 Status: Regular



do you mean a balanced cable, or a shielded cable?

my shitty cables pick up all sorts of crap, like the boiler
turning on and off for instance. my room's above the kitchen
and if i have my bass or guitar plugged in, i can pick up
the buzz from the kitchen strip light. it sounds cool when
it turns on, i may have to record it.


 

offline Drunken Mastah from OPPERKLASSESVIN!!! (Norway) on 2006-03-20 09:23 [#01863861]
Points: 35867 Status: Lurker | Followup to mylittlesister: #01863761 | Show recordbag



I'm just thinking of a regular phono <-> phono stereo
(unbalanced) cable which is somewhat shielded.


 

offline mylittlesister from ...wherever (United Kingdom) on 2006-03-20 10:19 [#01863921]
Points: 8472 Status: Regular | Followup to Drunken Mastah: #01863861



well, using balanced cables (phono <-> phone) would reduce
signal noise, picked up by the wires.


 

offline Drunken Mastah from OPPERKLASSESVIN!!! (Norway) on 2006-03-20 10:23 [#01863927]
Points: 35867 Status: Lurker | Followup to mylittlesister: #01863921 | Show recordbag



oh, wait

I meant the entire cable was unbalanced.. it still consists
of two balanced cables.. it's not a jack <-> jack. and I'm
not going to use just one 'cause I need stereo.


 

offline mylittlesister from ...wherever (United Kingdom) on 2006-03-20 10:29 [#01863930]
Points: 8472 Status: Regular | Followup to Drunken Mastah: #01863927



i'm sorry, i'm being very dumb [as you can tell by my "phono
<-> phone"], balanced cables are jack-2-jack, not
phono-2-phono.



 

offline E-man from Rixensart (Belgium) on 2006-03-20 11:32 [#01863968]
Points: 3000 Status: Regular | Followup to mylittlesister: #01863761



you problems don't come the cables you're using, it comes
from a poor electrical instalation:) you can solve it buying
electrical multi-plug with filter and protection against
power burst

mastah: if you turntable is grounded, the shielding is less
important
just put the cable away from main power cables, and if you
have to cross the two, cross them at a 90° angle



 

offline Drunken Mastah from OPPERKLASSESVIN!!! (Norway) on 2006-03-20 11:39 [#01863977]
Points: 35867 Status: Lurker | Followup to E-man: #01863968 | Show recordbag



well, as in any audio setup, the cable runs through an area
with tons of other cables all tangled up into something
which may become sentient at any given time, so... shielding
is important.


 

offline Taxidermist from Black Grass on 2006-03-20 11:56 [#01863990]
Points: 9958 Status: Lurker



Dude, have you though of buying studio cables or guitarist
cables? Those will be shielded to prevent a bomb, and for
what you are getting you will be paying half as much as
those moster cables and such. They charge way too much for
professional grade consumer goods. Just get professional
grade professional goods!


 

offline Drunken Mastah from OPPERKLASSESVIN!!! (Norway) on 2006-03-20 12:02 [#01863993]
Points: 35867 Status: Lurker | Followup to Taxidermist: #01863990 | Show recordbag



the problem with those cables (the normal "audio gear" ones,
at least.. like the ones for guitar -> amp, for instance) is
that they are jack <-> jack, not phono <-> phono, and while
the soundcard uses large jacks, the dj mixer uses phono (in
other words, I use phono <-> phono with phono -> jack
converters on one side.. I've never come across jack ->
phono converters, and with studio cables it doesn't really
get less expensive (they're sold in singles, not with two
paired cables, so I need 2x) nor higher quality (they aren't
gold plated)...


 

offline dave_g from United Kingdom on 2006-03-20 14:43 [#01864102]
Points: 3372 Status: Lurker



Ok look. Cables are really very important. Don't save money
on them, because good cables really do make a difference.

Ah right ok. Ignore bloke in shop. He works a low paid job
for a reason....
If you add additional grounds, you will likely introduce
ground loops, where small voltages in the grounds circulate.
Since the ground is not 0v, as it varies this voltage is
imposed onto the signal (by changing the reference voltage
you affect the signal voltage). This causes the hiss sound
you can hear.

You could of course wrap it with foil and connect it to only
one grounded end, but I have experimented with this, and
kitchen roll type alu foil is rubbish. I've used copper foil
at work with RF and that is better but I doubt you have easy
access to this.

I suggest getting a decent 3 metre cable. I have a nice one
made by JVC. Gold connectors, it's wonderful, not too pricey
either.

Balanced leads have 3 wires. Ground, hot and cold. Hot and
cold both carry the signal, but one is phase inverted to
the other, so any voltage spikes are cancelled out when the
signals are recombined. (one is inverted and the spike is
inverted, thus cancelling when combined,whereas the signals
when combined add)

An unbalanced stereo lead will have 3 wires, Left, Right,
Ground.
A balanced stereo lead will have 2x 3 wires, Left (hot cold
ground), Right(hot cold ground).

Anyway, phono has only 2 wires, so must be unbalanced. :)
And stereo phone is 2x2 wires,etc

My advice is that you get a decent chunky 3m phono cable and
use 2x phono to mono jack adapters at the sound card end.
With a decent cable you shouldn't notice any problems. Keep
away from mains leads if possible and cross them at 90
degrees to stop inductive pickup.

Run the mixer output loud(ish) and reduce the volume on the
soundcard input to increase the signal to noise ratio.
(don't overdrive the input or else you will get
distortion).

My setup is almost all unbalanced (over 90%) and it's not a
problem. Just make sure you use decent cables and use c


 

offline dave_g from United Kingdom on 2006-03-20 14:47 [#01864104]
Points: 3372 Status: Lurker | Followup to dave_g: #01864102



stupid pseudo-counter..
Just make sure you use decent cables and use correct
lenghts, no unecessary joins and things which will seriously
degrade grounding.
Please note grounding refers to shield generally.
The cables are co-axial, with ground as the outer, then
insulation then the signal carrying wire(s) in the centre. I
would do an ASCII diagram, but the patented xlt cock it up
system would 'remix' it.

Anyway, hope that kinda helps. Basically spend some money
:(
Don't spend silly amounts though. Decent/good consumer grade
should suffice.


 

offline QRDL from Poland on 2006-03-20 15:18 [#01864114]
Points: 2838 Status: Lurker



don't listen to them. Go for the rustic look. Wrap the cheap
cable in tin foil and connect it to the radiator with a
chain made of paper-clips.


 

offline Drunken Mastah from OPPERKLASSESVIN!!! (Norway) on 2006-03-20 15:33 [#01864120]
Points: 35867 Status: Lurker | Show recordbag



ah, thanks! just the confirmation I needed that I should
never trust hi-fi store employees on a single thing they
say.

I know cables are important (though I'm not very rich, so
monster-ish price class/quality is what I'm going for), and
I've actually had to prove how cable quality affects sound
to a guy who refused to believe it mattered (he was amazed
when he heard that thinner cables don't transmit as many
details in the sound.. heh), and basically all the other
cables than the turntable-soundcard one are well-shielded
and give good sound, but I've never had any use for a 3m
before...

heh, everything is crossed at all angles.. best pic I could
get.. only have a mobile phone thingie...


Attached picture

 

offline Drunken Mastah from OPPERKLASSESVIN!!! (Norway) on 2006-03-20 15:34 [#01864121]
Points: 35867 Status: Lurker | Followup to Drunken Mastah: #01864120 | Show recordbag



haha, obviously that should follow up to dave.


 

offline mappatazee from ¨y¨z¨| (Burkina Faso) on 2006-03-20 22:20 [#01864239]
Points: 14294 Status: Lurker



Here is a good way to test how bad the signals are
disturbing in your speaker cables. Turn your amp off and
put your ear to the speaker. All you will hear is the
distortion in the cable without any of the music (since the
amp is turned off!)

AMAZING!


 

offline Taxidermist from Black Grass on 2006-03-21 00:09 [#01864260]
Points: 9958 Status: Lurker | Followup to Drunken Mastah: #01863993



You know, I get almost all of my studio cables in well
reinforced pairs. Standard being double 1/4" mono to mono,
but you can also get double 1/4" mono to rca. Just about any
sizes. Go to the recording, dj or mixer section of your
local music equipment store. Don't go to the keyboards
section. They sell total ass.


 

offline E-man from Rixensart (Belgium) on 2006-03-21 13:20 [#01864598]
Points: 3000 Status: Regular



you don't have to worry about audio cable crossing or being
near each other, it's just the power cable that has to be as
far away as possible from the audio cable

and when i say cables aren't that important, off course you
need to have good cables, but if you take care of your
signal path, ground loops, etc.. cables won't affect much

imo it's silly to pay for monster cables if you have
consummer type equipment (which is 90% of the gear bedroom
producer/dj use) or if you use converters like those
phono->jack i see in the photo, because the benefit of the
cable is completly lost elsewhere

it's like buying silver cables when everything is done with
copper everywhere else, makes no sense :)



 

offline Taxidermist from Black Grass on 2006-03-21 13:39 [#01864615]
Points: 9958 Status: Lurker | Followup to E-man: #01864598



(You can get signal bleeding from poorly insulated cables
that are running alongside eachother)

But your right, its the electrical cables that are really
important to not cross with audio cables.

This is my jungle of cables. I probly have between 800 -
1000 feet of cables all told, and carefull consideration is
put towards making sure that audio cables do not cross power
cables at any point. There is only one point where the power
and audio meet, and they are at 90' angles, so as to
minimize any electrical interference in the signal path. If
I were to make any changes or move things around, it takes
at least 4 hours to rearrange everything.


Attached picture

 

offline Drunken Mastah from OPPERKLASSESVIN!!! (Norway) on 2006-03-21 14:50 [#01864663]
Points: 35867 Status: Lurker | Followup to E-man: #01864598 | Show recordbag



wait, what?

I know a bit about cables, man I just didn't know if this
extra insulation bullshit would work, and what you're saying
is silly

first of all, monster cables are consumer type
cables, so if you have consumer type equipment, it's
perfectly reasonable, and the converters don't account for
much signal loss, I'll tell you that.. if they're gold
plated and a tight fit next to nothing goes away in the
transfer.


 

offline vlari from beyond the valley of the LOLs on 2006-03-21 14:56 [#01864666]
Points: 13915 Status: Regular | Followup to Drunken Mastah: #01864120



from the crappy cellphone-pic it seems like you have the
same type of monstercable that I once had. It lasted me
about 3 years before it started humming just as bad as my
mother did when I was a kid.
don't know if it was due to me not treating it good enough,
but it kept me from buying more of that brand.
clas ohlson ones were good enough for me until I bought a
new soundcard where I couldn't use them any more. I kept
them as far away from any electrical cables so that might
have helped a bit.


 

offline Drunken Mastah from OPPERKLASSESVIN!!! (Norway) on 2006-03-21 16:26 [#01864703]
Points: 35867 Status: Lurker | Followup to vlari: #01864666 | Show recordbag



I've had these for quite some time, and they still work
fine, must've been use

you're aware that thinner cables don't transmit as rich and
detailed sound too, right?


 

offline Taffmonster from dog_belch (Japan) on 2006-03-21 16:30 [#01864705]
Points: 6196 Status: Lurker



you lose 5ohms of impedence per metre of cable
intresting eh


 

offline vlari from beyond the valley of the LOLs on 2006-03-21 16:40 [#01864710]
Points: 13915 Status: Regular | Followup to Drunken Mastah: #01864703



oh I have scrapped the clas ohlsons now. I bought some good
ones when I got a new soundcard. couldn't use the minijack
to rcas anymore


 

offline E-man from Rixensart (Belgium) on 2006-03-22 05:03 [#01864893]
Points: 3000 Status: Regular



well, what i mean is that monster cables, for the price you
pay, you better be sure everything in your signal chain is
ultra clean or else you could do with cable half the price
at least and never hear a change

many pro studios make their cables themselves with good wire
and good plugs, they don't need special expensive technology
because most of the time you can't hear a difference
many experiments have been made showing the total lack of
perceived difference between cables costing 100$ and cables
costing 10$ in normal listening conditions

what do you have in your signal chain?

i'm not here to bother you btw, just curious, and i saw so
much people buying expensive cables and not take care of the
rest i am now maybe a bit quick in judging :)



 

offline dave_g from United Kingdom on 2006-03-22 11:08 [#01865203]
Points: 3372 Status: Lurker | Followup to Drunken Mastah: #01864120



That mess of cables looks good. Infact it is better than
taxi's setup with them all running alongside one another in
close proximity.

Running them all along next to each other will cause pickup
and crosstalk between the cables.
I work with high frequency RF/microwave frequencies with my
job, and critical signal cables are generally not cable tied
together to minimise crosstalk. Of course audio is not half
as bad for radiating as high frequency stuff, but even so,
might as well do it the messy way and eliminate any problems
before they occur.

If you can do it the neater way and there are no problems
then of course you could do it that way too. Generally a
mixture between very neat and total mess seems to work well
for a mix of signal purity and ease of use/aesthetics.


 

offline Taxidermist from Black Grass on 2006-03-22 11:48 [#01865245]
Points: 9958 Status: Lurker | Followup to dave_g: #01865203



If you can figure out a way to run aproximately 600 to 1000
feet of cables without having them run along the floor in a
fashion that won't cause me to have them occupying every
single square inch of the room that they are in, then let me
know...


 

offline Drunken Mastah from OPPERKLASSESVIN!!! (Norway) on 2006-03-22 13:13 [#01865307]
Points: 35867 Status: Lurker | Followup to E-man: #01864893 | Show recordbag



oh, yeah, I know the stuff I have is just about equal to or
better than the cables in sound quality, and if I use the
thinner cables and A/B them with the monster ones from the
same source, I definately hear a difference.. the thin ones
lack lots of treble and generally add rumbling plus
distorted versions of signals from other sources (like the
tv, which is directly to the right of what you see in the
pic (which is an electribe drum synth thingie (<3 Hanal!)
and the break-out box part of an e-mu 1820 which are sitting
on the top of one of my speakers (both the speakers and the
e-mu are well shielded too actually.. the speakers are meant
to be close to tvs and shit so they don't "leak" magnetism
and noise so that they don't disturb the image))) while the
monster cable has no excess noise (I have to go to -5db to
even hear the white noise-ish thing, but then it could just
as well be another source leaking into the amp).

the stuff not mentioned already that's also hooked up are a
roland xp-30 digital synth, a 1210 going through a vestax
pmc-05 proIII, some crazy midi wiring and a dvd player going
in somewhere if I need it.

but.. what pro studios only consider normal listening
conditions? a chain isn't stronger than its weakest link,
and if someone has a high-end listening setup, the studio
shouldn't just go "ah, we'll just use this scrap metal and
create a wire," so I'm guessing that when they create their
own cables, they know what they're doing and do it
properly... signal loss at the source is the last thing you
want...

dave: so there's no ultra large spehrical magnetic field
being generated from, like, a ball of cables crossed in all
directions? I'd imagine it'd somehow maybe act like an
electromagnet where you curl the wire up and down someting
and whatever.. anyway, you know your shit, so I'll take your
word for it...


 

offline E-man from Rixensart (Belgium) on 2006-03-22 16:30 [#01865438]
Points: 3000 Status: Regular | Followup to Drunken Mastah: #01865307



all i'm saying is that maybe there is a middle ground
between shit cables picking hum and losing trebles, and
monster cables which are very expensive
but if you are happy with them it's cool :)



 

offline Drunken Mastah from OPPERKLASSESVIN!!! (Norway) on 2006-03-22 16:35 [#01865440]
Points: 35867 Status: Lurker | Followup to E-man: #01865438 | Show recordbag



not really, no.. there is shit and the next step is monster
if you go to regular music stores.. others may have a larger
leap with shit and then super high-end are the next step...
If I had enough money, I would get some of those super high
end things like nordost or something...


 


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