Copper Sleeve over IEC

Tbg, Thats what I thought that the shorting plugs were not to be used on outputs.

So, I sent an email to the gent selling some of these shorting plugs on Audiogon, here is a portion of his reply.
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"Hi, Thank you for your inquiry. The digital-terminators can be uses on in- and outputs. The analog-terminators "shorties" can only be used on inputs - never on outputs! "

Then I dug up a review of the Digital Shorting plugs.

From a review of the digital shorting plugs.
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"Now this one is completely new to me – both the concept and the application. The explanation for its effectiveness is somewhat different; it aims to combat not RFI but internal ‘reflections’ from unused S/PDIF in/outputs on CD players, transports and DACs, these claimed to interfere with the main output signal"

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I had some old RCA shorting plugs , some marked Digital and other analog. I used the the digital ones in both my CD Players input and output and it was a marked improvement. Putting copper sleeves over the Shorting plug dulled the sound.
When I pulled the copper sleeves off of the shorting plugs the CD player glitched and froze.
I unplugged and replugged the player and all is well, but I am not using the copper sleeves over the shorting plug..

Ozzy, I suspect there is a resistor in terminal and digital shorting plugs or that they are merely covers, such as those by Cardas.

There is a resistor.

"A 75 Ohm resistor within an RCA phono plug for the termination of the unused digital output or input can avoid this problem. The result is a more accurate, cleaner and well-balanced sound."

I wish they had chosen another name rather than shorting plug. People are going to put real shorting plugs into output and damaging their electronics.

They should call it a "Loading plug" opposed to "Shorting Plug"