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  1. #1

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    Default RCA Caps on unused inputs - worth it or not?

    So I have been looking around to find some RCA caps to put on the unused inputs of my HK Citation Eleven. I am finding prices all over the place.

    Besides keeping dust out, do the more expensive ones actually do anything else? I need a total of 16 for the HK to fill all the empty RCA sockets

    Some examples:

    Dayton RCA Jack Quiet Cap Covers 12 Pcs. - 6.25
    AUDIO ADDITIVES RCA CAPS 1.66 (Each) - 20 bucks for 12
    Cardas Signature RCA Caps - Package of 12 - 60 bucks
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    I have read that the RCA caps should keep EMI/RFI out of the component making for a cleaner signal. I have not used RCA caps so I cannot comment if this works or not, however.
    Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:

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  3. #3

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    Do the more expensive ones actually do anything else? yes, they do the dishes for you too lol.
    Sorry I had to let it go! Well. first they are all just caps they will do nothing else than just covering those RCA terminals. I would just leave them alone. Do not waste money like that, and if you really "need" to keep dust out of them...just cover them with electric tape. Beside NOBODY will look behind your amp.
    Make it simple...Make it better!

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    Quote Originally Posted by headrott View Post
    I have read that the RCA caps should keep EMI/RFI out of the component making for a cleaner signal. I have not used RCA caps so I cannot comment if this works or not, however.
    Yeah, I read that as well. I wanted to get some just so it would look nice and hopefully actually make a cleaner signal. However given the huge price desparity between some of these options I wanted to make sure if its worth the extra cash for the Cardas ones to get em, and if not to go with the cheaper Daytons.
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    Those caps simply short the input to ground. I fail see how the Cardas caps would make any difference especially since they are not in the direct signal path.

    Edit:

    Just read the description on the Cardas. Apparantly they do not short the input to ground. If not, then what the hell are they doing which would affect anything? Seems like snake oil to me.
    Last edited by DaveHo; 03-27-2013 at 01:47 PM.

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    Quote Originally Posted by DaveHo View Post
    Those caps simply short the input to ground. I fail see how the Cardas caps would make any difference especially since they are not in the direct signal path.
    So assuming they are made the same, they do very little besides look pretty, keep dust out and short the input. Good to know. Time to order the cheaper ones .
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    Dan
    There is also some that are plastic that come in colors to match the input color that are cheap.

  8. #8

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    They are unused inputs = No signal is coming in from them (unless you switch to them).
    All this is a gadget to steal money from you and wash your brain. Do not fall into it!

    PS: the best solution is to remove them from the back and they will not pick up any E.M.I/R.F.I or any U.F.O...lol
    Make it simple...Make it better!

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    Quote Originally Posted by pitdogg2 View Post
    Dan
    There is also some that are plastic that come in colors to match the input color that are cheap.
    Link?
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    Quote Originally Posted by lanchile View Post
    PS: the best solution is to remove them from the back and they will not pick up any E.M.I/R.F.I or any U.F.O...lol
    So you want me to tear into a 30 year old pre-amp to phsyically remove inputs I dont need now, but could need later? That sounds like a LOT more work than spending 15 bucks on some covers.... and kinda dumb IMHO.
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    Ivan, NM, I decided to not be lazy and just google and found some (link for others). Thanks for the heads up.

    Plastic v. Metal doest matter does it?
    Last edited by EndersShadow; 03-27-2013 at 02:11 PM.
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    Quote Originally Posted by lanchile View Post
    They are unused inputs = No signal is coming in from them (unless you switch to them).
    All this is a gadget to steal money from you and wash your brain. Do not fall into it!

    PS: the best solution is to remove them from the back and they will not pick up any E.M.I/R.F.I or any U.F.O...lol
    Have you experimented with placing end caps on your RCA inputs and listening for differences in the audio signal? Or, are you assuming that the end caps do nothing?
    Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:

    "I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion."

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    Quote Originally Posted by EndersShadow View Post
    Ivan, NM, I decided to not be lazy and just google and found some. Thanks for the heads up.

    Plastic v. Metal doest matter does it?
    Plastic is non-conductuve, and the idea is to short stray RFI to ground. So, plastic is cosmetic, metal is functional.

  14. #14

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    Quote Originally Posted by headrott View Post
    Have you experimented with placing end caps on your RCA inputs and listening for differences in the audio signal? Or, are you assuming that the end caps do nothing?
    I work fixing and build amps, testing them with oscilloscope (my boss place) and all this is crab!
    Make it simple...Make it better!

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    Quote Originally Posted by EndersShadow View Post
    So you want me to tear into a 30 year old pre-amp to phsyically remove inputs I dont need now, but could need later? That sounds like a LOT more work than spending 15 bucks on some covers.... and kinda dumb IMHO.
    Lol, do you know the word "sarcasm" I guess you did not get it!. What I am trying to say is Do not fall into this. if you really must buy these caps to protect them from dust...Because that is the ONLY thing these thing do...just get the cheapest plastic ones.
    Make it simple...Make it better!

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    Quote Originally Posted by BlueFox View Post
    Plastic is non-conductuve, and the idea is to short stray RFI to ground. So, plastic is cosmetic, metal is functional.
    while the above is true in all my years i have never ever had any of those RFI/EMI problems they supposedly fix. 90% of inputs on any of my gear is never used and it just helps keep the oxidation off them for any future use. I normally have better use of my time than sit and clean inputs/outputs with Q-tips and Deoxit or WD40 which also works. I have looked at both but have not made the leap...

  17. #17

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    these are the ones i use(analog). they keep out dust,short the plugs and look neat on my gear.
    http://app.audiogon.com/listings/twe...pple-valley-ca
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  18. #18

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    Quote Originally Posted by BlueFox View Post
    Plastic is non-conductuve, and the idea is to short stray RFI to ground. So, plastic is cosmetic, metal is functional.
    Plastic or metal all I see is cosmetic...even with an oscilloscope I can not see increasing or decreasing in Radio Frequency Interference. The metal ones will be very good when I have to check the DC offset in amps...just plug them in and the input are shorted then I can check and fix dc offset.
    Make it simple...Make it better!

  19. #19

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    Get the Daytons from PE..I think they will work and look well.
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  20. #20

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    OK, I rest my case here. since most of you guys "know" and have "tested" and of course can hear the difference between metal and plastic RCA terminals connected into input terminals that are also "not in use". I will leave you with that wrong mentality.
    Make it simple...Make it better!

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    Quote Originally Posted by lanchile View Post
    OK, I rest my case here. since most of you guys "know" and have "tested" and of course can hear the difference between metal and plastic RCA terminals connected into input terminals that are also "not in use". I will leave you with that wrong mentality.
    What do your measurements show about power cords? About interconnect cables? About speaker cables?

  22. #22

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    Quote Originally Posted by michael1947 View Post
    Get the Daytons from PE..I think they will work and look well.
    Yeah, I am probably going to order 2 sets. I believe the plastic part is a little bubble decal I can probably pull off so they are just silver with no logo. The plastic ones are probably fine as well, but there isnt a huge cost difference.

    Need to find some other stuff on Parts Express to order though as shipping on those is about the price of a set of them lol....
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    Quote Originally Posted by BlueFox View Post
    What do your measurements show about power cords? About interconnect cables? About speaker cables?
    That is another subject! But, What I measured is: Resistance, Electro Magnetic Interference, Radio Frequency interference and impedance. also I have a toy at home called Wideband Powerline noise digital analyzer and I can check all power lines (noisy outlets) and build filters to suppress or clean ac lines.
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    Be careful as I've heard the Dayton Audio end caps don't always fit well on every application.

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    these what you are looking at Dan?

    http://www.parts-express.com/pe/show...umber=091-1090

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    I use the Cardas Signature caps. Do they do anything besides cover the unused RCA's? I don't know and I don't care.
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  27. #27
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    These shorting plugs are $0.69 from MCM, and can reduce noise in certain systems and environments. Do not use shorting plugs on outputs as you may damage components.

    http://www.mcmelectronics.com/produc...-0006-/27-5335

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    The shorting caps can absolutely reduce system noise. Not like, "Listen to the increased texture and depth!" but like, "Oh... that hiss I used to hear from 4 feet away is gone now". Will vary based on your system and the architecture of your pre, but doesn't hurt to try them out.

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    Quote Originally Posted by F1nut View Post
    I use the Cardas Signature caps. Do they do anything besides cover the unused RCA's? I don't know and I don't care.
    Tell us how you really feel Jesse.
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    Quote Originally Posted by pitdogg2 View Post
    Yes, those are the ones.

    Quote Originally Posted by F1nut View Post
    I use the Cardas Signature caps. Do they do anything besides cover the unused RCA's? I don't know and I don't care.
    I can always count on you for the straight up truth with no BS

    Quote Originally Posted by zingo View Post
    These shorting plugs are $0.69 from MCM, and can reduce noise in certain systems and environments. Do not use shorting plugs on outputs as you may damage components.

    http://www.mcmelectronics.com/produc...-0006-/27-5335

    Attachment 83297
    So in looking at a picture of the back of my Citation 11 pre, I dont want to use it on Pre-Amp Output 2, Tape Output 1, or Tape Output 2 is what your saying correct?

    Attachment 83301
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