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Discussion Starter · #1 ·
I have a complicated hum/hiss/white noise issue.


I am working on the hum but have not resolved the white noise issue. Dave from Jensens transformers mentioned possible rf signal being picked up or other interference so I want to cap all other inputs on m ep2500 and ep4000


This requires 4 total 1/4 shorting plugs, does anyone know exactly what to look for?


Also there does not seem to be such a thing as an xlr shorting plug because all m research on shorting xlr's talks about turning them into rca. Does this mean you modify an xlr with an rca adapter then take an rca cable and modify that into a shorting plug?
 

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If you have a soldering iron it's easy.

Just jumper pin #2 to pin #3.


If you can't solder.

Take an old XLR cable/with connector.

Cut the cable so that it's 2 or 3 inches long.

Strip some insulation off the cut end.

Tightly twist the 2 signal wires together.


Same with RCA's.

Just take an old cable and modify it.
 

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You can make your own shorting plugs easily enough. You want to tie both the hot and shield together on an RCA type plug. I haven't build an XLR one yet, but I believe it would be tying all pins together.
 

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Quote:
Originally Posted by michael hurd /forum/post/18251653


You can make your own shorting plugs easily enough. You want to tie both the hot and shield together on an RCA type plug. I haven't build an XLR one yet, but I believe it would be tying all pins together.

Well, the signal is between Pins #2 & #3.

Pin #1 is connected to the unit's chassis and is not part of the signal circuit.

But it might not make much difference to an input connector.
 

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Discussion Starter · #5 ·

Quote:
Originally Posted by michael hurd /forum/post/18251653


You can make your own shorting plugs easily enough. You want to tie both the hot and shield together on an RCA type plug. I haven't build an XLR one yet, but I believe it would be tying all pins together.

What is the shield again?


I need 1/4 shorting pins. I thought 1/4 was just one cable and didn't have a hot. I am fine with buying them, it looks like they are $2 max but they come in stereo and mono and I don't know what I need. The xlr shorting pin is what confuses me. I am sure I will need to make it but not sure how.
 

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On an XLR the signal pins are #2 & #3. the shield is pin #1.


On a 1/4inch Phone Plug. T,R,S.

It's Tip & Ring for the signal.

Shield for the shield.
 

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Discussion Starter · #7 ·

Quote:
Originally Posted by Speedskater /forum/post/18251918


On an XLR the signal pins are #2 & #3. the shield is pin #1.


On a 1/4inch Phone Plug. T,R,S.

It's Tip & Ring for the signal.

Shield for the shield.

over my head


I'll buy the 1/4 ones but it is hard to tell if they are selling adapter/cable pins or shorting pins.


I'm very new to this thing
 

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Discussion Starter · #8 ·

Quote:
Originally Posted by Speedskater /forum/post/18251645


If you have a soldering iron it's easy.

Just jumper pin #2 to pin #3.


If you can't solder.

Take an old XLR cable/with connector.

Cut the cable so that it's 2 or 3 inches long.

Strip some insulation off the cut end.

Tightly twist the 2 signal wires together.


Same with RCA's.

Just take an old cable and modify it.

What do you do for a 1/4 plug?


It seems like you can buy them.


For the XLR pin, which are 2 and 3? Do you go clockwise with the 2 pins on top so you connect what looks like it should the the negative and ground (might not be but looks like it)?


I am ok with soldering but don't you still need to start with a chord and cut it or can you use something else and just buy the end part?
 

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For XLR, buy however many of these you need.


The pinouts are marked on the connector itself. I believe for an input conector you would use a male connector.




For TRS (1/4") buy however many of these you need.


There is no pin 1,2 etc on a TRS connector; You have Tip, Ring & Shield


You need to tie all three together.




If you are comfortable with soldering you can just use any wire you have lying around, CAT5e, lamp cord, etc.. Pretty much anything conductive that will take solder.


Like was mentioned earlier you could also buy the cheapest XLR/TRS cable from rat shack, cut the wire, strip it and twist the wires together. Tape or heatshrink over the bare wire and you are done.
 

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Discussion Starter · #10 ·
I am looking at the 1/4 picture and trying to make sense


When it is assembled don't they all touch anyway?


Do you just need to stick something into the center of the tip and solder that to the ring?


It just looks like they all touch anyway so I am not sure where the cables would go for the solder.
 

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Quote:
Originally Posted by goonstopher /forum/post/18260976


I am looking at the 1/4 picture and trying to make sense


When it is assembled don't they all touch anyway?


Do you just need to stick something into the center of the tip and solder that to the ring?


It just looks like they all touch anyway so I am not sure where the cables would go for the solder.

Look at the pictures on this web page, maybe a light bulb will go off. Typically #17 works well when connecting "home" to "pro" equipment.
http://www.rane.com/note110.html


I have an EP2500, never heard of shorting plugs, this worked well for me.
 

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Quote:
Originally Posted by goonstopher /forum/post/18260976


I am looking at the 1/4 picture and trying to make sense


When it is assembled don't they all touch anyway?


Do you just need to stick something into the center of the tip and solder that to the ring?


It just looks like they all touch anyway so I am not sure where the cables would go for the solder.

No, of course they don't all touch in normal use. they are concentric and there is plastic insulation between them; you can even see it on the plug.


Look at the pic Beemer posted for the TRS. There are 3 terminals; two are the small tabs near the main body and the other is the long tab that extends out. Get a short length of bare copper and solder all three of them together. That's it - not hard.
 

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Discussion Starter · #13 ·
The only picture i can find about making them says you need to add a resistor.


Is there anywhere I can buy these things?
 

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Quote:
Originally Posted by goonstopher /forum/post/18268607


The only picture i can find about making them says you need to add a resistor.


Is there anywhere I can buy these things?

I've never used a resistor in a shorting plug for audio, just wire. You may have found some sites mention a 50R or 75R resistor for RF, but that's not required for AF.
 

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Discussion Starter · #15 ·

Quote:
Originally Posted by A9X-308 /forum/post/18269448


I've never used a resistor in a shorting plug for audio, just wire. You may have found some sites mention a 50R or 75R resistor for RF, but that's not required for AF.

I just want to get this white noise out of my subs and thought this would be cheap enough to try but it has me more confused and everyone seems to say it is so simple so I am missing something. I get the xlr one because it seems fool proof but the 1/4 plug is something that is a bit confusing. Also would like o figure rca but not as important. I just feel like a meat head because I can't get my head around it.
 

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Quote:
Originally Posted by goonstopher /forum/post/18297323


Could I buy a TRS 1/4 to trs 1/4 cable and splice it open and cross/connect all 3 wires?

That is the same as soldering a wire across the terminals as described earlier.


"Will this fix my problem"


I doubt it, but the attempt is cheap and easy enough to do, so trying it eliminates one possibility.
 
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