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What wire for making IEM cables? - Page 2

post #16 of 29
6/28/10 at 4:14pm
Quote:
Originally Posted by ccfoodog View Post

They have some silicone coax listed here:

 

  http://www.coonerwire.com/Products/MiniCoax.taf

 

-john


Brilliant!

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post #17 of 29
6/30/10 at 3:28pm
Thread Starter 

Anyone have any thoughts about this stuff:

 

http://www.coonerwire.com/Products/MIWC.taf?_function=SILI_SC

 

It looks pretty optimal.  My measurement suggests a single wire used in the Westone/UE custom cables is about .03 - .04" OD. 

 

If I'm reading this correctly, the AS 155-28 is 28 AWG, has 65 strands of silver plated copper with an OD of .034" and a soft silicone insulator.  Various colors available even.  Is .066 ohms/ft. an issue?

 

"Silver Plated Copper Conductor, Silicone Rubber Insulation

Description

Miniature, extra-flexible stranded silver-plated copper conductor insulated with a ten mil wall of color coded silicone rubber.
Temperature rating: -60°C to +200°C. Voltage rating: 600 V.D.C.

Applications

Useful on various medical instruments and medical appliances where flexibility, durability, high temperature rating, miniature diameters and appearances are desired."

 

 

Part
Number		 Conductor Nom.
Wall
Thick		 Nom.
O.D.		 Ohms
Per
Foot
AWG
Size		 Circ. Mils No. of
Wires		 AWG & Dia.
of Wires		 Construction Nom.
Dia.
AS 155-28 28 160.55 65 46(.0016) 65/46 Bunch .0138 .010 .0340 .066

 

 

Conductor Color Code: 1. White 3. Red 5. Yellow 7. Brown 9. Gray (Slate)
  2. Black 4. Green 6. Blue 8. Orange 10. Violet (Purple)

 

Thoughts?

 

Thanks,

 

-john

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post #18 of 29
6/30/10 at 4:25pm
Thread Starter 

OK, now I'm a bit confused.  I tried to measure the resistance of the custom UE cable.  I read something like 1.1 to 1.2 ohms on my old Fluke 73.  Supposedly this is like 46", but since it is twisted it is probably a bit longer.  This is tip to tip so it includes the plugs at each end.

 

I cut about 46" of Navships 19 strand 28 AWG silver plated copper and read about .3 ohm.  I only have probes on the multimeter, so I wound the wire around the probes.  Not sure how accurate this is, but hand holding it wasn't doing the trick.

 

I expected these readings to be a lot closer.  What is going on here?

 

Do the plugs make that much of a difference, or is the difference in the wire?  Or my measurements?

 

What impact does resistance have on IEM wire?  Wouldn't lower resistance be better?

 

?!?

 

Thanks,

 

-john

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post #19 of 29
7/2/10 at 9:14am
Thread Starter 

Looks like the silicone clad stuff is about $7.50 - $7.90 a foot in small quantities.

 

AS155-28

25 feet @ $7.89/ft

Delivery: stock (black, blue, brown, gray, green, orange, red, white, and yellow)

 

AS155-30

25 feet @ $7.50/ft

Delivery: stock (black, blue, gray, green, orange, red, violet, white, and yellow)

 

-john

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post #20 of 29
7/2/10 at 1:33pm

Lower is better, but most of the resistance comes from the solder connection, it's not an issue of lead vs silver but an issue of joint quality. If your phones are around 18ohms I wouldn't worry about one or two ohms in the cable, because 9/10ths of the voltage will drop over the drivers themselves.

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post #21 of 29
7/2/10 at 3:32pm
Thread Starter 

 

Thanks.

 

I'm thinking of getting some of the silicone clad stuff and giving it a try.  It is a bit more expensive that I had hoped, but oh well.

 

Anyone know what kind of wire Westone and UE use for their "memory wire".  It clearly isn't real memory wire, but I imagine they use something that is fairly resistant to memory fatigue.

 

Ideas?

 

Thanks,

 

-john

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post #22 of 29
7/2/10 at 3:45pm

you can buy 30 awg 99.99 % silver wire for 1.20c per foot ish

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post #23 of 29
7/2/10 at 4:41pm
Thread Starter 

Clad with what?  I have various wire, but the insulation is too stiff and microphonic to make a decent IEM cable.

 

-john

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post #24 of 29
7/3/10 at 12:41pm

Have you tried say a cotton insulation with a two ply shoe lace?

This should reduce microphoncs.

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post #25 of 29
7/5/10 at 8:44am

So john manage to get those cables in yet?

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post #26 of 29
7/5/10 at 11:23am
Thread Starter 

Heh.  I haven't even ordered yet.  But I'll probably get enough to make one cable and try it out.

 

I'm also wondering if Cymbal Monkey is on to something with the coax wire.  Might make a nicer overall shape.

 

-john

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post #27 of 29
7/6/10 at 11:52am

If you can find coax that isn't so stiff, and is just as thin, and is cheap, I will personally get on a plane and find you and worship you as a god. Coax is wonderful stuff, I kept having problems with my phone going off and getting hit with a tone of noise, no such problems with coax.

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post #28 of 29
7/8/10 at 3:01am

Hi cymbal monkey, those tefzel-aircraft-cable, since you gotten them and tried,  how would you grade them? 

Not in the sense of sound quality but more so on the, physical quality, stiffness? is it multi -stranded?

haha

Do you have a picture of it?

 

 

Cheers.

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post #29 of 29
8/10/10 at 12:34pm

It's multi stranded and horribly stiff. But it's tough as nails.

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