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Cable routing
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Old 15th December 2017, 08:32 PM   #1
Terathlios is offline Terathlios  Greece
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Default Cable routing

Hello all!

I'm trying to build a pair of cabinets (will make new thread when done) and I have an electromagnetic question. The cables for the speakers will pass from the rear of the cabinet, through a piece of 21mm plywood to the speaker.

I use CAT6 cables and I was wondering two things:
  1. Are the CAT6 cable sufficient for 35W speakers, considering the small diameter?
  2. Is there any electromagnetic interference if the cables pass through one hole like in the photo below?
Thank you in advance for your insight.

-Kostis.
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File Type: jpg Speaker cables.jpg (331.3 KB, 169 views)
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Old 15th December 2017, 09:03 PM   #2
globalplayer is offline globalplayer  Germany
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I would at least use a cross section of 2,5mm˛ to preserve some damping factor.
There will always be electromagnetic interference between currents in parallel wires but I think it`s negligible in this case.
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Old 15th December 2017, 09:20 PM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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I wouldn't worry about it.
I usually use 13 amp mains cable for speaker cables.
Cheap and does the job well.
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Old 15th December 2017, 10:04 PM   #4
scottjoplin is offline scottjoplin  Wales
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Those thin wires look wrong to me, probably work but there are reasons larger cables are used. Those are designed for small high frequency signal use. Twisting will cancel RFI pick up but not emission, but that's not an issue.
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Old 15th December 2017, 10:30 PM   #5
MAAC0 is offline MAAC0  Portugal
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Let's make some maths:


35W in 8 Ohm will be something in the 2A range. The wires can handle it.
The problem is they are flimsy and break easily.
I Use 1.5 to 4mm on my speakers (4mm por +300W PA use).
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Old 15th December 2017, 10:56 PM   #6
globalplayer is offline globalplayer  Germany
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35 w / 8 ohm = 4,375 amps
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Old 15th December 2017, 11:29 PM   #7
Dave R is offline Dave R  United States
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Quote:
Originally Posted by globalplayer View Post
35 w / 8 ohm = 4,375 amps
oops. don't forget to take square root.

P = I^2 * R
or
I = sqrt(P/R) = sqrt(35/8) = sqrt(4.375) = 2.09 amps
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Old 15th December 2017, 11:47 PM   #8
globalplayer is offline globalplayer  Germany
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Sorry, my bad.
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Old 16th December 2017, 10:04 AM   #9
DF96 is online now DF96  England
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Quote:
Originally Posted by Terathlios
Are the CAT6 cable sufficient for 35W speakers, considering the small diameter?
Depends whether you are worried about safety or sound quality.

For sound quality it is not the speaker power which matters but speaker impedance. Cat 6
is rather thin for 8 ohm speakers. Why choose a wholly inappropriate cable?

For safety you need to consider impedance and power. Calculate current and think about duty cycle. As a general rule, if the cable is thick enough for sound then it will be thick enough for safety - unless you are wiring a stadium.
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Old 16th December 2017, 10:41 AM   #10
Terathlios is offline Terathlios  Greece
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Quote:
Originally Posted by scottjoplin View Post
Those thin wires look wrong to me, probably work but there are reasons larger cables are used. Those are designed for small high frequency signal use. Twisting will cancel RFI pick up but not emission, but that's not an issue.
First of all, thank you all for the replies. I decided to use these because it's mentioned in the forum that CAT5/6 cables are more than good for the job and the bigger cables are not needed. The diameter of the copper wire is 0.7mm. Will it suffice for the job? Moreover, I understand that twisting the cables is a good thing(?). Because, I didn't know what to do with the twisting.
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