hi at all (sorry for my bad english I’m italian)
I have buy this kits and they works but if i put the master volume level of my pc at max the sound present scratch and disturb, i need to put the master sound to med level for solve this problem and this is not good the volume level is low 
another quest, when i turn off the power at the circuit and i turn on later the volume level is 0 is normal i need to push the volume up too much for listen any thin
thanks in advance