Grounding and earphone, how to make a clean sound from the headphones?


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Good day!
There are expensive headphones with bells and whistles and the fact that the connector connect the headphones through USB when connecting to rear panel PC (2.0)noise it is barely noticeable, but in complete silence is annoying, when you connect via 3.0, nothing changes.

PC is not grounded

Sellers have asked and advised to buy a USB-HUB, I do not understand, because the usb hub is just the dilators, but I said, saying that they are somehow unable to remove electrical noise, etc!

With fire wood everything is OK, cecal on other computers where grounding do not, there is generally a tin, well actually in the shop where it was ground noise and not a drop of pure Studio sound !

Question is it true there are usb hub's and if is possible an example?
Is there any way to ground the PC?
Rather looking for the electronic items which can work as a filter SOCKET-FILTER-PC.
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3 Answers

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1) model headphones
2) the nature of the noise
3) where did the idea of grounding? and especially USB hub
Wang: not very expensive motherboard, bad power supply filtering USB ports that are "singing" noise. Where interference is also an important issue. Either from the mains or the computer itself geranium (e.g. HDD or optical drive, if present. the power fans also sometimes give background).
It is possible that it can help just filter the power outlet (extension cord with filter. by the way, read what they are, from just a stupid capacitor to quite a interesting schemes). This is the easiest and painless, maybe not the cheap but simple.
In the second case is more complicated. May (just may) help USB hub with external power supply. Usually PSUs have their filrouge chain and they can drown out some noise. Or himself on the basis of the USB extension cable to make a home-made, by including in the circuit a simple LC filter (capacitor with inductance). There are ready-made and quite compact options such as time and two.
If you are very lucky there will be enough such that the ferrite ring:
59db31112168e413722733_750.jpg
If you can not wait, then a sample can be taken apart some non-working charger and use a pulse transformer - SMATV all the windings and wound a couple of rings of wire of their headphones.
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I had a lot of static on speakers, and I was helped by that sort of thing - apc p1-rs (Google) - background was barely audible.
Perhaps you will help, but maybe not different interference on the network a lot and not all of them easy to clean.
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The noise is probably 50 Hz. You need to ground the PC case, it is possible to the battery, but it is a bad option. In apartment buildings the nearest grounding point is a metal shield with electric meters in the entrance, you can wire to hold. If you have cable TV it is possible to ground from the outer part of the shielding.
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