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FORUMS Post Processing, Marketing & Presenting Photos Video and Sound Editing 
Thread started 09 Feb 2013 (Saturday) 11:33
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Audio For Video, XLR Adapter Cables.

 
Channel ­ One
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Feb 09, 2013 11:33 |  #1

As anyone who has served time doing field production knows there is the theoretical or kosher way to do something and then there is the real world.

In the theoretical (book learnt) world, every output you wish to connect to would be a balanced XLR male connector waiting for your cable, but in the real world, that connection can be almost anything imaginable, though some of the most common outputs being via RCA and 1/8 aka 3.5 mm or 1/4 inch TRS connectors.

As such, a wise audio guy always has a bag of adapters on hand, this however has a down side and that is the rule of missing devices, which states the more adapters one owns the greater the chance of the one adapter being needed and needed right now, will come up missing.

The solution is to carefully balance the number of adapters in the bag against the possible combinations needing to be adapted and this is where a connector made by Neutrik reduces that part count by two, yes I know that is a small number, but it is a beginning.

So with no further ado, I introduce the Neutrik NC3FM unisex XLR connector.

http://www.neutrik.com​/en/xlr/convertcon/nc3​fm-c (external link)

With two of these connectors and a hank of Belden 8412 microphone cable I was able to build three heavy duty source to recorder cables into one cable.

The standard male to female XLR pigtail.

IMAGE: http://www.channel1images.com/Assets/f2m.jpg


A male to male XLR pigtail.

IMAGE: http://www.channel1images.com/Assets/m2m.jpg


And a female to female pigtail.

IMAGE: http://www.channel1images.com/Assets/f2f.jpg


Another nice factor about this cable is it eliminates stacking, that is to say going from a TRS jack to female XLR with an adapter and then gender bending the adapter to a XLR male with a double stacked M2M adapter and then finally to a pigtail.

This is an example of such a stack which was used by Channel 4 UK to allow their cameraman to pull program audio from a distro amp, note the gaffers tape I applied to the microphone cord to eliminate the downward pull on the stack by gravity to prevent any damage to the distro amps jack.

IMAGE: http://www.channel1images.com/Assets/distro.jpg

The reason to avoid stacking is, a double stacked adapter connected to a XLR cable is a sure way to damage a mixer, as it only takes a light tug on the cable to place a large force upon the 1/4 inch jack in the mixer and a good tug on the cable is a great way to insure you will be picking up a repair bill for replacing a jack on someone else’s mixer.

Wayne

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ben_r_
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Feb 12, 2013 14:31 |  #2

WTH!?!?! Those are AWESOME!!!!

Can buy them here: LINK (external link)for anyone interested.


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joeblack2022
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Feb 12, 2013 14:33 |  #3

I saw those announced a while back, haven't had the chance to try them out yet.

And yes they are awesome for adapter cables, they will cut your kit in half!


Joel

  
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Feb 12, 2013 17:21 |  #4

ben_r_ wrote in post #15602722 (external link)
WTH!?!?! Those are AWESOME!!!!

Can buy them here: LINK (external link)for anyone interested.

FWIW they are in stock here.

http://www.markertek.c​om …rik-USA-Inc/NC3FM-C.xhtml (external link)

Wayne


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Feb 12, 2013 18:01 |  #5

joeblack2022 wrote in post #15602731 (external link)
I saw those announced a while back, haven't had the chance to try them out yet.

And yes they are awesome for adapter cables, they will cut your kit in half!

In time, for now I need to build a 3.5mm TRS to XLR and a 1/4 inch to XLR, but haven't been able to source minature matching transformers.

Wayne


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ben_r_
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Feb 14, 2013 16:34 |  #6

Channel One wrote in post #15603430 (external link)
In time, for now I need to build a 3.5mm TRS to XLR and a 1/4 inch to XLR, but haven't been able to source minature matching transformers.

Wayne

Transformers?

You can get nice pre-made 1/4" to XLR ones for cheap from monoprice: LINK (external link)


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joeblack2022
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Feb 14, 2013 18:42 |  #7

Yep transformer is required to match impedance.


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Feb 14, 2013 18:59 |  #8

joeblack2022 wrote in post #15611047 (external link)
Yep transformer is required to match impedance.

You can sort of do it with a T-Pad, but I prefer to use a transformer as that way I can isolate hot and return on the balanced side, from ground on the un-balanced side.

While it raises the cost of building an adapter, using a transformer in my opinion, eliminates many in the field problems caused by disparate grounds and RF ingress.

Wayne


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