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papaned
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Digital Caps

I don't know if this topic has been discussed, but being a sucker for cheap tweaks, I installed terminator caps on the unused BNC and XLR digital outputs of my CD player. I would characterize the improvement as sounding sharper and more defined.I confirmed this in blind tests with several young listeners still having good hearing.Very pleased with the results for about $20.
I can hear DUP panting like a junkyard dog and Ethan telling me that it's an illusion.

Elk
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Re: Digital Caps

What do the terminator caps do? Do they ground the outputs?

papaned
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Re: Digital Caps

Apparently not. The BNC cap is rated 75 ohms , costs less than $2.00 at The Parts Connection. This I tried first and it provided the noticeable improvement. The Cardas XLR caps cost #30. a pair and are advertised as EMI, RF sheilds.When added, I couldn't detect a difference.Maybe better ears could tell.

Elk
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Re: Digital Caps

It makes sense to me that there can be less noise if an input is grounded out.

I don't understand how simply covering a digital output would matter one way or the other - although I do not doubt your experience.

For $2.00 I don't care if it is just placebo however; better sound for $2 is well worth it no matter how it works.

mrlowry
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Re: Digital Caps

I'd always heard that when creating a cap for unused digital outputs that one should solder a 1 ohm resister between the signal pin and ground.

It's a slightly different topic but I've made my own "shorting RCAs" for unused inputs on my preamp. A "Shorting RCA" is of course an RCA where the signal pin and the ground are connected. Shorting RCAs should NEVER be used on ANY output. Not only did the blacks get blacker, but it removed a small amount of glare and hardness in the upper midrange. It's a nice affordable tweak that I don't mentioned anymore.

ethanwiner
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Re: Digital Caps


Quote:
Shorting RCAs should NEVER be used on ANY output.


Nor should a capacitor be connected directly across an output either. Unless it's in series with a resistor, and you know what you're doing to avoid blowing up the output.

--Ethan

cyclebrain
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Re: Digital Caps

The term digital caps can be missleading. Do you mean caps as in shorting cap, or caps as in capacitor?
In my line of RF work, unused test outputs are terminated with the correct matched load (50 ohm in my case)in order to minimize signal reflections being transfered to the main signal. Sometimes I can measure a difference, sometimes not.
Always a good idea. I am using analog RF signals, but the fast rise and fall times of a digital signal could be affected also.

ethanwiner
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Re: Digital Caps

I meant cap as in capacitor. Unlike RF, audio outputs don't need to be terminated. Though some toob power amps need that.

papaned
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Re: Digital Caps

Both digital caps that I used don't short anything, as previosly explained.I was hoping to get some feedback from others who may have tried these on their digital front- end units.
BTW, my solid state amp came with RCA caps [shorting ?] with instructions by the mfr. [Simaudio] to install these onto the unused input terminals to improve sound.So there must be something to capping unused digital and analog terminals.

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