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Topic # 148824 1-Jul-2014 21:30
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I was just wondering if anyone was using a cheap $2 rca cable for their subwoofer, or if the shielded ones at $$$ are the only way to go?

Does anyone have any experience or advice using cheaper rca cables?

Cheers

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  Reply # 1078274 1-Jul-2014 21:37
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Don't know about the price but quality is better. Years ago I used some thin cheap poor quality coax cables on my subwoofer and suffered heaps of hum. Changed to thicker higher quality and the hum disappeared.

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  Reply # 1078277 1-Jul-2014 21:39
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totally depends on you.

first if your sub is > $1000 i suggest you spend the few dollars to get a shielded cable with the proper resistance (i think from memory 75 Ohm - please google)

if you sub is $50 (i won't call that a sub but that's another story) then don't bother

but i have tried both and haven't noticed any difference, but that is totally non scientific.

maybe someone else can shed more light.



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  Reply # 1078309 1-Jul-2014 22:10
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Thanks for the replies. The sub is pretty low end, around $250.

Another factor is that I'm going to experiment with it as second sub (5.2). So I'm a bit reluctant to buy another sub cable in case I'm not happy with it / doesnt work out.



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  Reply # 1078314 1-Jul-2014 22:15
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To be fair, the characteristic impedance of the cable is of very little concern... instead, you should be looking for decent shielding. Especially if you're looking to run a cable for 3-4 meters, or even longer.
I've seen systems where people have used cheap cables and had a buzzing sub, as well as hum from systems where two cables have been joint (male to female connectors)... all of which has been fixed with a $60 off the shelf cable. Could they have gone cheaper? Maybe... but the buzzing of a sub is VERY annoying.



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  Reply # 1078325 1-Jul-2014 22:35
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Thanks, that's what I have read.

As it would be 1.5-2m max (sorry I should have stated), I wasn't too sure if a quality cable would be needed. 

I was going to try one sub on the other side of the tv first, then try the sub behind the listening position (I already have a 5m shielded cable).

If no one states otherwise, maybe I should stop being tight and try a cheap one first.

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  Reply # 1078326 1-Jul-2014 22:36
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Subs still insist on using stupid unballanced RCA cables, and you are connecting something which is normally earthed into a whole lot of stuff that is usually earthed and on a different power circuit.

Not had the hum get solved with a fancier cable, but have chucked a cheap car audio isolator on the RCA cable to get rid of most hum.




Richard rich.ms

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  Reply # 1088109 13-Jul-2014 16:30
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richms: Subs still insist on using stupid unballanced RCA cables, and you are connecting something which is normally earthed into a whole lot of stuff that is usually earthed and on a different power circuit.

Not had the hum get solved with a fancier cable, but have chucked a cheap car audio isolator on the RCA cable to get rid of most hum.


I have a good sub, and a good quality shielded cable, but still have that hum, can give give me more detail on what you put on ? the Car Audio isolator ?

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  Reply # 1088120 13-Jul-2014 17:08
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It was a round thing from jaycar with 2 RCA plugs, and 2 RCA sockets made to eliminate groundloops in cars. Did the job nicely on the sub too.




Richard rich.ms

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  Reply # 1088126 13-Jul-2014 17:26
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richms: It was a round thing from jaycar with 2 RCA plugs, and 2 RCA sockets made to eliminate groundloops in cars. Did the job nicely on the sub too.


Does this look like it ? http://www.jaycar.co.nz/productView.asp?ID=AA3084

W
hat did you hook those wires to ?

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  Reply # 1088197 13-Jul-2014 19:07
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Same brand, same principle. different product tho.

I didnt have to earth it at all to get any benifit from it. I think that will just be earthing the core of the transfromer or have a screen between the 2 windings to stop capacitivly coupled crap making it thru.




Richard rich.ms

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