For my taste there is to much hum that is produced from my speakers. When i come very close with my ears i can clearly hear the hum in the sound (receiver volume is set to 50), when i carefully listen i can swear i can hear it further away (normal listening position), too. If the volume level is set very high (that is 70 and above) the hum becomes annoyingly loud. Interesting is also that every time the volume level goes exactly to 70 i realize a popping sound for a brief moment. Is that normal, especially when i own quality speakers (B&W), receiver (Onkyo 595), cables (QED) and the computer is digitally connected to the receiver?