Headphone amplification

The weird thing is that this doesn't happen on either computer when I plug into the front headphone jack. Only when the headphones are plugged into the speakers, unless maybe it is happening but the volume using the front jacks isn't high enough to hear the noise.

These headphones have a 45mm magnet in them so it takes some ummph to get these things really thumping.

For a test, I think I'll plug the audio outs from the computers into an Onkyo stereo receiver I have and plug the headphones into that to see if it still happens, that would tell me if it's the amplified headphone jack from the Klipsch speakers.

If I need to I'll buy a sound card for each computer and install them internally.

Digger

I don't know what you have but look around for any ferrite loop like this one.
http://www.adamsmagnetic.com/images/Adams_toroids.jpg

Now pass the audio out cable through that and loop it through 3 or more times. Without a spectrum analyzer or such I try 3 to 10 times (more specific, 3,5,7,10) and see if that kills what is being picked up.

Alternatively, and in a pinch I've had rare success by simply making a knot in the cord. The idea is that high frequencies can't pass. Remember that rarely works but in the field you learn to give it a try before heading back to the shop/office.
Bob

computer's, we didn't go cheap, even on the rca wiring. We have these audio cables with ferrites =>
http://www.amazon.com/kenable-Ultra-Phono-Cable-Ferrites/dp/B0079I7TSM/ref=sr_1_3?ie=UTF8&qid=1400097064&sr=8-3&keywords=rca+cables+with+ferrite

But if you think it might help, I'll go buy the rings.

Digger

So it will likely have zero effect. Then again you can roll the ball.
http://www.indra.com/8ball/front.html

gee thanks

Digger

I read the thread and dealt with this problem as well over the yrs. I found that these simple build PCs are bound to have issues because in audio you have "real time" effect and your ear can pick it up. The PC is simple when it comes to audio and all the circuits are low-amp/voltage and the circuits still pick-up the same freqs that RF around any circuit, etc.. You got all that "exposed" circuitry on the mtrbd. and anything else isn't on the hi-quality side, so you can pick-up unfiltered or non-squelched noise. if you've seen hi-end audio like in recording studios or anything where audio is "prime $" maker, effort is made to reduce all this. Enuff' said, but yeah its a known issue. Sometimes if card based, move to another slot, if mtrbd., oops, can try to clean up, maybe the ferrite clamp will help on routing cables. It's hard to fix on a mtrbd. itself, especially is you don't have the schematics, etc. and anything is huge to SMC type circuits. Further, if you got earmuffs that have that big of an magnet, then you say it handles huge audio inputs, then you have to crank it up abit to get it going, may not be a good match. Sometimes, I think audio is a PITA once you truly get into high quality side of things. Since, you deal with this you must see pricing on non-PC setups aren't cheap so adding a PC in the mix maybe a downgrade, excluding PC computing side. Audio to me has always been analog and digital while good or even decent is another mix of issues that has to be dealt with.

tada -----Willy