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smarkgee's picture
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Shielding Speaker Cables - ** HOW **
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I have an issue with an amp tripping. Ichange the amp it still trips. I change the speakers, it still trips, i have run another set of speaker cables....you guessed it. It still trips. It trips with the amp not connected to ANY source.I've even run an extension lead to take power from a different circuit in the house Smile      (before you ask!) So logically I have not got any problem.... All I have not tried is shielding the speaker cable. The cables run fairly close to the main fuse box for the house and they also run fairly close to other cables, including power cables. So my question is: HOW CAN I SHIELD MY EXISTING CABLES? Is there some sort of copper shielding that Ican buy similar to that found inside coax cable?? And will any such shielding make any difference? many thanks

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RE: Shielding Speaker Cables - ** HOW **

shielding the speaker cables won't do anything.  Sounds like you need to get your electrics looked at.

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RE: Shielding Speaker Cables - ** HOW **

You can buy sheilded speaker cables but not sure that will solve your problem. I would get an electrian to check your wiring first.

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RE: Shielding Speaker Cables - ** HOW **

Have you checked for damage to the speaker cables that may be causing a short?

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RE: Shielding Speaker Cables - ** HOW **

Petherick wrote:

Have you checked for damage to the speaker cables that may be causing a short?

he says he's already changed the speaker cables for testing though....

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RE: Shielding Speaker Cables - ** HOW **

smarkgee wrote:
I have an issue with an amp tripping. Ichange the amp it still trips. I change the speakers, it still trips, i have run another set of speaker cables....you guessed it. It still trips. It trips with the amp not connected to ANY source.I've even run an extension lead to take power from a different circuit in the house Smile      (before you ask!) So logically I have not got any problem.... All I have not tried is shielding the speaker cable. The cables run fairly close to the main fuse box for the house and they also run fairly close to other cables, including power cables. So my question is: HOW CAN I SHIELD MY EXISTING CABLES? Is there some sort of copper shielding that Ican buy similar to that found inside coax cable?? And will any such shielding make any difference? many thanks

Do you seriously think that your speaker cables are picking up something from the mains that would be powerful enough to "trip" an amplifier?  Whilst in theory something like that might be possible I cannot believe it would ever happen in practice.  Much more likely is that there is some mismatch between amp and speakers or you have just wired them up incorrectly.  What is the amp/speaker combination?  How have you wired them?

Chris

Marantz PM8005 / SA8005 / KEF R700s / AKG K702

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RE: Shielding Speaker Cables - ** HOW **

Shielding makes sense but is a little more complex than just using a shielded cable.

This makes some interesting reading; http://www.analog.com/static/imported-files/tutorials/MT-095.pdf.

I use chokes on most cables but it is only one form of noise supression.

regards

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RE: Shielding Speaker Cables - ** HOW **

When you say that it "trips" are you referring to a trip switch inside the amplifier or a trip switch for your house mains?

 

Unless the cables are touching and shorting I don't think that they're going to the cause of your problem. My guess is that there might be something wrong with your amplifier. It's probably worth getting a professional to have a look at it.

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RE: Shielding Speaker Cables - ** HOW **

steve_1979 wrote:

. My guess is that there might be something wrong with your amplifier. It's probably worth getting a professional to have a look at it.

 

but he says he's changed the amp and it still trips...  Unless it's two faulty amps?

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RE: Shielding Speaker Cables - ** HOW **

make sure the speaker cables aren't touching the chassis of the amp or anything like that

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RE: Shielding Speaker Cables - ** HOW **

cheeseboy wrote:

but he says he's changed the amp and it still trips...  Unless it's two faulty amps?

Ahh yes so he did.  :doh:

 

Does any other equipment make the mains trip or is it just hifi amplifiers?

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RE: Shielding Speaker Cables - ** HOW **

Just use the usual process of elimination logic to find the cause. 

Try different mains sockets or even a different room. (Or a different house.)

Try it without speakers at all (headphones).

Try it with different mains leads. 

If possible try different speakers.  (Does a friend or relative have a pair to borrow? Any old working speakers in cupboards or attic?)

Check the entire length of all cables for any cuts or crushed areas where a short might have occurred.

Usual stuff. You'll get there.

It won't make any difference shielding the speaker cables. Your amp is simply protecting itself from something that is wrong like a persistent short or incorrect connection. It could be inside the speakers or the amp or external connections. Mains wiring is unlikely unless you know something has changed just before the fault started.

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RE: Shielding Speaker Cables - ** HOW **

thanks guys, i've done pretty much all the usual testing things. it's something wierd and i THINK I am reasonably intelligent!! (maybe others say not)

i have had this problem for YEARS and have spent days trying to solve it.

i've had the arcam power amp serviced (anyway i've tried with a different amp and with that amp standalone) i have celeestionA speakers which are 8ohm...anyway i changed them for 4 ohm...no difference. as i say i replaced the cables and used a slightly different route.

this morning i turned on a remote (large) PC screen and the amp tripped internally (NOT MAINS FUSE THE AMP FUSE). so was that some sort of surge on the main elec??? or maybe it was a power/video signal going down the DVD-i cable - as that cable would be fairly close to the speaker cables

 

honestly, i'm about to kill myself over this. :help:

 

all help so far appreciated

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RE: Shielding Speaker Cables - ** HOW **

its not a permanent problem. after a few minutes it might go away (soemtimes stays longer than that).

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RE: Shielding Speaker Cables - ** HOW **

Maybe you need to get a sparky around to check out the house electrics.

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RE: Shielding Speaker Cables - ** HOW **

As I said before you need to get a sparky in,  your wiring does not sound safe and could cause a fire.

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