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microphone cable impedance

 
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endertak
alignin' 24-trk


Joined: 23 Mar 2008
Posts: 70

PostPosted: Sun Apr 17, 2016 9:10 pm    Post subject: microphone cable impedance Reply with quote

I'm getting around to be more serious about making my own cables.
I assume that there is some sort of minimum impedance desired for cable runs that are between 10 and 20 feet long. Can someone please enlighten me on the particulars of that?

Hoping on grabbing some affordable mic cable for all my various studio gear, so it'd be mostly balanced cable for synths and drum machines etc.

Thanks for any thoughts on minimum gauge and/or impedance, conductivity, capacitance, shielding, etc.
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Magnetic Services
gettin' sounds


Joined: 17 Apr 2012
Posts: 128
Location: Milwaukee

PostPosted: Sun Apr 17, 2016 10:20 pm    Post subject: Re: microphone cable impedance Reply with quote

I've been using Pro Co Dynamike 224S (24 gauge I think?) for XLR and TRS cables. I don't know the specs very well, but I haven't had any problems with it yet.

As far as I know, braided shields are 90-95% effective, and allow the cable to bend a little more naturally. Foil shields are supposed to be almost completely effective but not as flexible.

I have also been hunting for a good brand of multi-pair snake cable though, as I get more ambitious about re-doing my patchbays. Hopefully someone who replies can suggest something!
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dfuruta
re-cappin' neve


Joined: 08 May 2009
Posts: 697

PostPosted: Sun Apr 17, 2016 10:47 pm    Post subject: Re: microphone cable impedance Reply with quote

edit: duplicate

Last edited by dfuruta on Sun Apr 17, 2016 11:10 pm; edited 1 time in total
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dfuruta
re-cappin' neve


Joined: 08 May 2009
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PostPosted: Sun Apr 17, 2016 10:48 pm    Post subject: Re: microphone cable impedance Reply with quote

most modern audio equipment should have fairly low impedance outputs (under a couple hundred ohms), and audio frequencies are relatively low. so, i wouldn't worry about impedance & capacitance for 20'. a few hundred, maybe.

like magnetic services said, shielding and durability are bigger concerns.
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Nick Sevilla
speech impediment


Joined: 03 Mar 2008
Posts: 4421
Location: Los Angeles California USA

PostPosted: Mon Apr 18, 2016 11:17 am    Post subject: Re: microphone cable impedance Reply with quote

I like the Canare Star Quad cables for microphones.

http://www.canare.com/ProductItemList.aspx?productCategoryID=5
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JWL
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Joined: 02 Apr 2006
Posts: 1863
Location: Maine

PostPosted: Tue Apr 19, 2016 2:59 am    Post subject: Re: microphone cable impedance Reply with quote

Nick Sevilla wrote:
I like the Canare Star Quad cables for microphones.


I've had good luck with this cable too. I'm not 100% convinced quad is necessary, but it don't hurt.

I got mine from Redco.
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Nick Sevilla
speech impediment


Joined: 03 Mar 2008
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Location: Los Angeles California USA

PostPosted: Tue Apr 19, 2016 9:14 am    Post subject: Re: microphone cable impedance Reply with quote

To me it's more about the ruggedness.

Manly cable. Can take the abuse.

Laughing
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Scodiddly
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Joined: 10 Dec 2003
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Location: Mundelein, IL, USA

PostPosted: Tue Apr 19, 2016 11:43 am    Post subject: Re: microphone cable impedance Reply with quote

Audio cable doesn't have, or need, a characteristic impedance like antenna cable. That's because the frequencies aren't high enough for that to even remotely matter.
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vvv
zen recordist


Joined: 13 May 2003
Posts: 7886
Location: Chi

PostPosted: Tue Apr 19, 2016 1:46 pm    Post subject: Re: microphone cable impedance Reply with quote

I frequently use crappy Banjo-Mart and Ebog-bought mic cable's; I consider them to be something between a filter and a special effect.

Twisted Evil
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Drone
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Joined: 18 Dec 2009
Posts: 569
Location: Uranus

PostPosted: Tue Apr 19, 2016 2:28 pm    Post subject: Re: microphone cable impedance Reply with quote

What sort of price does Banjo-Mart have on cables?
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vvv
zen recordist


Joined: 13 May 2003
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PostPosted: Tue Apr 19, 2016 3:15 pm    Post subject: Re: microphone cable impedance Reply with quote

I've gotten 20' guitar cables and 20' XLR mic cables at US$10 during sales, and sometimes just on the floor. For some reason they seem to throw the tied circles onto mic stands a lot, literally "on the floor".

Also, if you buy a guitar, etc., they'll often throw in a cable.

I have no problem cutting up and re-ending guitar cables for patch cords for the bay or for FX pedal-boards.
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Jim Williams
tinnitus


Joined: 03 Jun 2006
Posts: 1124
Location: beautiful Carlsbad, CA

PostPosted: Fri Apr 22, 2016 11:13 am    Post subject: Re: microphone cable impedance Reply with quote

I use Belden 9182 LAN network cable for mics. 150 ohm impedance, 70% propagation delay (70% the speed of light) teflon insulation and 22 AWG wire.

It's 8 pf per foot stray capacitance, very low. Compared to star quad, it's like after your ears pop landing in a jet. I have little or no need to boost the hi end as I don't lose any of it.

Paramount Pictures rewired their entire foley building with it after I brought a few long runs down to evaluate. I use Neutrik connectors with the plastic inserts pounded out to clear the cable diameter.
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