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78 posts

Master Geek


#267976 21-Feb-2020 11:21
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Looking for cable for rear surround sound speakers.

 

Before I go out and buy some, does anyone have leftovers gathering dust they want to clear out?

 

I need runs of about 7m and 10.5m.


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  #2424984 21-Feb-2020 13:02
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Out of interest what differentiates speaker cable with any other copper cable? Is there any reason you could just use say spare electrical cable which should be plenty thick enough?





Speedtest 2019-10-14


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Master Geek


  #2424995 21-Feb-2020 13:09
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If you are considering spending money on premium speaker cable:

 

https://www.quora.com/Are-premium-speaker-cables-a-ripoff

 

I was always told that the most important thing is to match the lengths so both speakers present the same load to the amp.


 
 
 
 




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Master Geek


  #2424998 21-Feb-2020 13:14
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Zeon:

 

Out of interest what differentiates speaker cable with any other copper cable?

 

 

Just that I'm using it for speakers :-)

 

 

Is there any reason you could just use say spare electrical cable which should be plenty thick enough?

 

 

I don't have spare cable of any type to use :-)

 

... but probably not the place for a speaker cable debate, or we'll be lost in a world of snake oil and I still won't get round to installing these speakers ;-)


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  #2425007 21-Feb-2020 13:50
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pbolger:

 

I was always told that the most important thing is to match the lengths so both speakers present the same load to the amp.

 

 

I recall being told the same thing last century (the 1990s!) - but there are now lots of people that also argue this is a have, given the relatively short distances the signal is travelling, eg:

 

 

5 Myths About Speaker Wire

 

Speaker wires should be the same length: It seems to make sense that speaker wires should be identical to eliminate phase shifts. But electrical signals travel through speaker wire at near the speed of light. It would take miles of speaker wire to hear any difference. So having wires a foot or two (or 10) different is irrelevant.

 

https://www.machinedesign.com/community/editorial-comment/article/21832227/5-myths-about-speaker-wire

 

 


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Master Geek


  #2425138 21-Feb-2020 19:10
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I recall being told the same thing last century (the 1990s!) - but there are now lots of people that also argue this is a have, given the relatively short distances the signal is travelling, eg:

 

 

Obviously the idea that a couple of extra metres of cable will result in a phase shift is just silly, but there is an argument that having more cable to drive on one channel will affect the performance of the amplifier as the resistance would be different.

 

See this article for some insight.

 

The cheapest decent speaker cable may well be a couple of premade 15amp extension cords with the plugs chopped off.


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  #2425174 21-Feb-2020 20:40
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Table 5.5 - Resistance per metre of copper conductors at 20°C for

 

Conductor cross-sectional area      Resistance per metre run

 

(mm²)                                               (m ohms / m)

 

1.0                                                         18.1

 

1.5                                                         12.10

 

2.5                                                         7.41

 

4.0                                                         4.61

 

6.0                                                         3.08

 

10.0                                                       1.83

 

16.0                                                       1.15

 

25.0                                                      0.727

 

that's in mili ohms, would need about 55m of 1.0mm2 cable to make an ohm of difference


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Master Geek


  #2425177 21-Feb-2020 20:53
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I do. Never used still coiled up not sure of length I'll check shortly.


 
 
 
 


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  #2425198 21-Feb-2020 22:52
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Where are you?


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  #2425199 21-Feb-2020 22:52
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Where are you?


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Master Geek


  #2425201 21-Feb-2020 23:32
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Kopkiwi:

 

Where are you?

 

Northland. 

 

The cable is packed inside a banana box in my lounge but finding it may take a while - mainly due to the ~15 other banana boxes also in my lounge.

 

We moved house recently :P

 

 


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  #2425215 22-Feb-2020 02:14
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Zeon:

Out of interest what differentiates speaker cable with any other copper cable?

 

 

The price. Jaycar sells good-quality speaker cable for $1-2 per metre, labelled as power cable. The same thing labelled as OFC speaker cable is at least twice as much, and that's before you get into woo-woo speaker cables for which the sky is the limit.

 

 

Best speaker cable woo-woo I've found is silver cable dipped in liquid nitrogen or similar. Lots of golden-ears types agree that you need this, but no-one is ever able to explain by which mechanism it works. I mean, magic room-aligning audio crystals at least have some sort of pseudoscientific babble around them, but the cryogenic cables are widely hyped without anyone ever telling you what woo-woo is being invoked.



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Master Geek


  #2425264 22-Feb-2020 09:28
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Kopkiwi:

 

Where are you?

 

 

I'm in Nelson.


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  #2425276 22-Feb-2020 09:57
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mgeek:

 

Kopkiwi:

 

Where are you?

 

 

I'm in Nelson.

 

 

 

 

Bugger, am in Christchurch. I THINK I have a couple hundred meters of 12AWG sitting around doing nothing somewhere.


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  #2426189 24-Feb-2020 10:15
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its rear speakers . Rears are often cheapies and mainly playing sound effects : boom crash bangs , no need for high quality.

What he should be spending money on is audio quality fuses. A mere $500+
:-)


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  #2426195 24-Feb-2020 10:29
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16 gauge wire without aluminium wrapped through the copper to drop its manufacturing costs is all you'll need.

 

14 gauge is nice, but a lot of cheaper speakers can't actually fit it in their terminals.

 

 

 

Remember, don't terminate the cable over the top of your amplifier, the copper has a habit of falling in and shorting the amp.

 

Remember not to leave spare strands sticking out of the terminals - you only need to strip the cable back 8mm.

 

 


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